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Information about Amazing Math Trick

Published on May 4, 2007

Author: simonesu

Source: slideshare.net

Fun to know about math if you know how to use its

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The 7-11-13 trick! This trick makes you look like your brain is a mega fast calculator! Ask a friend to write down ANY three digit number such as 231 or 884. Ask them to multiply the number by x 7 x 11 x 13 ...but even if your friend has used a calculator, you will have written down the answer ages ago! It's fiendish! THE SECRET: all you do is write out the starting number twice! So 231 will become 231231 and 884 will become 884884. You don't believe it? Well try it on this calculator and see for yourself! You work this calculator by clicking the mouse on the buttons. Go on, put in ANY three digit number then x7 x11 x 13 and see what you get!

This trick makes you look like your brain is a mega fast calculator!

Ask a friend to write down ANY three digit number such as 231 or 884. Ask them to multiply the number by

x 7 x 11 x 13

...but even if your friend has used a calculator, you will have written down the answer ages ago! It's fiendish!

THE SECRET: all you do is write out the starting number twice! So 231 will become 231231 and 884 will become 884884. You don't believe it? Well try it on this calculator and see for yourself! You work this calculator by clicking the mouse on the buttons. Go on, put in ANY three digit number then x7 x11 x 13 and see what you get!

The 3367 trick: This trick is similar to the 7-11-13 trick. It's harder to do, but it looks far more miraculous! Get a friend to pick any 2 digit number e.g. 74 x 3367 To work out the final answer you have to imagine the original number written out three times e.g. 747474 then divide it by three. 249158 This one takes practice, but unlike the others, it's very hard to see how it's done!

This trick is similar to the 7-11-13 trick. It's harder to do, but it looks far more miraculous!

Get a friend to pick any 2 digit number e.g. 74

x 3367

To work out the final answer you have to imagine the original number written out three times e.g. 747474 then divide it by three. 249158

This one takes practice, but unlike the others, it's very hard to see how it's done!

The MISSING DIGIT trick! Here it is! Go and hide in a cupboard, or cover your eyes in some way so that you can't see what your friend is writing. Ask a friend to secretly write down ANY number (at least four digits long). e.g. 78341 Ask the friend to add up the digits... e.g. 7+8+3+4+1 = 23 ... and then subtract the answer from the first number. e.g. 78341 - 23 = 78318 Your friend then crosses out ONE digit from the answer. (It can be any digit except a zero) e.g. 7x318 Your friend then reads out what digits are left .e.g. 7-3-1-8 Even though you haven't seen any numbers, you can say what the missing digit is! EIGHT THE SECRET This great trick relies on the power of 9. After your friend has added up the digits and subtracted them, the answer will ALWAYS divide by 9. If a number divides by nine, then when you add the digits up, they will also divide by 9. If you check our example 7+8+3+1+8 = 27 which does divide by nine. When your friend crosses a digit out, he then reads out the digits that are left. You add them up. In the example we had 7+3+1+8 = 19 All you do now is see what you have to add on to your answer to get the next number that divides by nine! The next number to divide by 9 after 19 is 27. So you need to add on EIGHT. This is the number that was crossed out!

Here it is!

Go and hide in a cupboard, or cover your eyes in some way so that you can't see what your friend is writing.

Ask a friend to secretly write down ANY number (at least four digits long). e.g. 78341

Ask the friend to add up the digits... e.g. 7+8+3+4+1 = 23

... and then subtract the answer from the first number. e.g. 78341 - 23 = 78318

Your friend then crosses out ONE digit from the answer. (It can be any digit except a zero) e.g. 7x318

Your friend then reads out what digits are left .e.g. 7-3-1-8

Even though you haven't seen any numbers, you can say what the missing digit is! EIGHT

THE SECRET

This great trick relies on the power of 9.

After your friend has added up the digits and subtracted them, the answer will ALWAYS divide by 9. If a number divides by nine, then when you add the digits up, they will also divide by 9. If you check our example 7+8+3+1+8 = 27 which does divide by nine.

When your friend crosses a digit out, he then reads out the digits that are left. You add them up. In the example we had 7+3+1+8 = 19

All you do now is see what you have to add on to your answer to get the next number that divides by nine! The next number to divide by 9 after 19 is 27. So you need to add on EIGHT. This is the number that was crossed out!

Birthday Trick This math trick will determine your birthday. Just follow the steps with a calculator and press equal after each step. Go ahead and try the trick without cheating! For a simple, online JavaScript calculator, click on the calculator button. 1. Add 18 to your birth month 2. Multiply by 25 3. Subtract 333 4. Multiply by 8 5. Subtract 554 6. Divide by 2 7. Add your birth date 8. Multiply by 5 9. Add 692 10. Multiply by 20 11. Add only the last two digits of your birth year 12. Subtract 32940 to get your birthday! The answer's format is: month/day/year. For example, an answer of 123199 means that you were born on December 31, 1999. If the answer is not right, you followed the directions incorrectly or lied about your birthday.

This math trick will determine your birthday. Just follow the steps with a calculator and press equal after each step. Go ahead and try the trick without cheating! For a simple, online JavaScript calculator, click on the calculator button.

1. Add 18 to your birth month

2. Multiply by 25

3. Subtract 333

4. Multiply by 8

5. Subtract 554

6. Divide by 2

7. Add your birth date

8. Multiply by 5

9. Add 692

10. Multiply by 20

11. Add only the last two digits of your birth year

12. Subtract 32940 to get your birthday!

The answer's format is: month/day/year. For example, an answer of 123199 means that you were born on December 31, 1999. If the answer is not right, you followed the directions incorrectly or lied about your birthday.

The "24" Mystery! A Murderous Math fan called OBAID pointed out that if you square ANY prime number bigger then 3, then subtract 1, the answer always divides by 24! E.g. 112 = 121 then 121 - 1 = 120 and yes 120 does divide by 24. WHY? If you understand algebra, (and you've read The Phantom X ) then you'll know that all prime numbers can be written as (6n+1) or (6n-1). (6n+1)2 = 36n+12n+1. So (6n+1)2 -1 = 36n+12n. This factories to 12n(3n+1). Either n or (3n+1) must be even, therefore the whole expression must be divisible by 24. (6n-1)2 = 36n-12n+1. So (6n-1)2 -1 = 36n-12n. This factories to 12n(3n-1). Either n or (3n-1) must be even, therefore the whole expression must be divisible by 24.

A Murderous Math fan called OBAID pointed out that if you square ANY prime number bigger then 3, then subtract 1, the answer always divides by 24! E.g. 112 = 121 then 121 - 1 = 120 and yes 120 does divide by 24.

WHY?

If you understand algebra, (and you've read The Phantom X ) then you'll know that all prime numbers can be written as (6n+1) or (6n-1).

(6n+1)2 = 36n+12n+1. So (6n+1)2 -1 = 36n+12n. This factories to 12n(3n+1). Either n or (3n+1) must be even, therefore the whole expression must be divisible by 24.

(6n-1)2 = 36n-12n+1. So (6n-1)2 -1 = 36n-12n. This factories to 12n(3n-1). Either n or (3n-1) must be even, therefore the whole expression must be divisible by 24.

The Prime Number Trick Using prime numbers, you can amaze your friends with a prime prediction... Ask your friends to pick any prime number bigger than 5, but they must not tell you what it is. Square it. (In other words multiply the prime number by itself.) Add 17 Divide by 12 Without knowing which prime number your friends picked, you can still tell them: There will be a remainder of 6. For example, if you want to try the trick with the prime number 2801, here's what to push: 2801 * 2801 = + 17 = / 12 = ...and that's the answer! Now find a new prime number and try it.

Using prime numbers, you can amaze your friends with a prime prediction...

Ask your friends to pick any prime number bigger than 5, but they must not tell you what it is.

Square it. (In other words multiply the prime number by itself.)

Add 17

Divide by 12

Without knowing which prime number your friends picked, you can still tell them: There will be a remainder of 6.

For example, if you want to try the trick with the prime number 2801, here's what to push:

2801 * 2801 = + 17 = / 12 =

...and that's the answer! Now find a new prime number and try it.

THE AMAZING MATH TRICK OF 1999 1. First of all, pick the number of days a week that you would like to eat out. 2. Multiply this number by 2. 3. Add 5. 4. Multiply it by 50. 5. If you have already had your birthday this year . . . add 1749. If you have NOT had your birthday yet this year . . . add 1748. 6. Last step: Subtract the four digit year that you were born. You should now have a three digit number: The first digit of this was your original number (i.e. how many times you want to go out to eat each week). The second two digits are your age !!! This is the only year it will ever work, so spread the fun around while it lasts . . .

1. First of all, pick the number of days a week that you

would like to eat out.

2. Multiply this number by 2.

3. Add 5.

4. Multiply it by 50.

5. If you have already had your birthday this year . . .

add 1749.

If you have NOT had your birthday yet this year . . .

add 1748.

6. Last step: Subtract the four digit year that you

were born.

You should now have a three digit number:

The first digit of this was your original number (i.e.

how many times you want to go out to eat each week).

The second two digits are your age !!!

This is the only year it will ever work, so spread the

fun around while it lasts . . .

Phone Number Trick Here is a math trick so unbelievable that it will stump you. Personally I would like to know who came up with this and why that person is not running the country. 1. Grab a calculator. (you won't be able to do this one in your head) 2. Key in the first three digits of your phone number (NOT the area code) 3. Multiply by 80 4. Add 1 5. Multiply by 250 6. Add the last 4 digits of your phone number 7. Add the last 4 digits of your phone number again. 8. Subtract 250 9. Divide number by 2 Do you recognize the answer ??????

Here is a math trick so unbelievable that it will stump you. Personally I would like to know who came up with this and why that person is not running the country. 1. Grab a calculator. (you won't be able to do this one in your head) 2. Key in the first three digits of your phone number (NOT the area code) 3. Multiply by 80 4. Add 1 5. Multiply by 250 6. Add the last 4 digits of your phone number 7. Add the last 4 digits of your phone number again. 8. Subtract 250 9. Divide number by 2 Do you recognize the answer ??????

Joker’s Math Trick 1 complete this amazing Math Trick just follow the instruction below and complete the steps. You'll be surprised with the results! All you'll need is a pen or pencil and some paper! Pick a number between 1 and 100. Multiply it by 5. Add your age minus the number in family. Divide the number by 10 rounding to the nearest decimal. Write down the number on one side of a piece of paper. Pick another different number between 1 and 100. . Multiply by 1998. Add the number in your family and subtract your age. Divide the number by 10 rounding to the nearest decimal. Write down the number on the other side of the piece of paper.

complete this amazing Math Trick just follow the instruction below and complete the steps. You'll be surprised with the results! All you'll need is a pen or pencil and some paper!

Pick a number between 1 and 100.

Multiply it by 5.

Add your age minus the number in family.

Divide the number by 10 rounding to the nearest decimal.

Write down the number on one side of a piece of paper.

Pick another different number between 1 and 100. .

Multiply by 1998.

Add the number in your family and subtract your age.

Divide the number by 10 rounding to the nearest decimal.

Write down the number on the other side of the piece of paper.

Joker’s Math Trick 2 Take the first 2 digits of your home phone number and add them to the last 2 digits of your phone number. Multiply by 365. Write the number on a new sheet of paper. Fold the first page in half. Now fold the second page. Place them side by side. Now pick up the two sheets - sheet one in your left hand and sheet two in your right hand. Find a bin/drawer and place the sheets in it. Now using both your hands... Slap yourself around the head while repeating: "I'm a stupid person who wastes too much time on junk like this."

Take the first 2 digits of your home phone number and add them to the last 2 digits of your phone number.

Multiply by 365.

Write the number on a new sheet of paper.

Fold the first page in half.

Now fold the second page.

Place them side by side.

Now pick up the two sheets - sheet one in your left hand and sheet two in your right hand.

Find a bin/drawer and place the sheets in it.

Now using both your hands...

Slap yourself around the head while repeating: "I'm a stupid person who wastes too much time on junk like this."

5 squared shortcut Trick 1 Here is a really quick way to square any number with a 5 on the end Lets take Ok, so what you have to do is split up the numbers, giving you and Forget about the for the moment and do this: Always add 1, adding 1 to the 4, so we get 4 + 1 = 5 Then multiply this answer, 5, by the original first number, 4 5 X 4 = 20 So what you have is 20 and Everyone knows = 25 right? Well it does. This is what makes it easy. Put the two answers together and that's the answer! 2025

Here is a really quick way to square any number with a 5 on the end Lets take

Ok, so what you have to do is split up the numbers, giving you

and

Forget about the for the moment and do this:

Always add 1, adding 1 to the 4, so we get 4 + 1 = 5

Then multiply this answer, 5, by the original first number, 4

5 X 4 = 20

So what you have is 20 and

Everyone knows = 25 right? Well it does. This is what makes it easy.

Put the two answers together and that's the answer!

2025

5 squared shortcut Trick 2 This works for any number ending in but when the numbers get over 100 it tends to get a little trickier with the multiplication. Give it a try with another number. Try , it isn't difficult. Split the numbers apart: 8 and Again, forget about the Add 1 to 8 8 + 1 = 9 Multiply 9 by the first number, which was 8 9 X 8 =72 Now, put all the numbers together, 72 and = 25

This works for any number ending in but when the numbers get over 100 it tends to get a little trickier with the multiplication.

Give it a try with another number.

Try , it isn't difficult.

Split the numbers apart:

8 and

Again, forget about the

Add 1 to 8

8 + 1 = 9

Multiply 9 by the first number, which was 8

9 X 8 =72

Now, put all the numbers together, 72 and

= 25

Sex Math Trick Your Age by Sex Math. This is pretty neat! Check it out.... YOUR AGE BY SEX MATH DON'T CHEAT BY SCROLLING DOWN FIRST! It takes less than a minute....... Work this out as you read... You might need a small piece of scrap paper for simple addition and subtraction. 1. First of all, pick the number of times a week that you would like to have sex. (more than once but less than 10) 2. Multiply this number by 2 (Just to be bold) 3. Add 5. (for Sunday) 4. Multiply it by 50 I'll wait while you get the calculator................ 5. If you have already had your birthday this year add 1755.... If you haven't, add 1754 .... 6. Now subtract the four digit year that you were born. You should have a three digit number The first digit of this was your original number (i.e., how many times you want to have sex each week). The next two numbers are ......... YOUR AGE! (Oh YES, it is!!!!!)

Your Age by Sex Math. This is pretty neat! Check it out.... YOUR AGE BY SEX MATH DON'T CHEAT BY SCROLLING DOWN FIRST! It takes less than a minute....... Work this out as you read... You might need a small piece of scrap paper for simple addition and subtraction. 1. First of all, pick the number of times a week that you would like to have sex. (more than once but less than 10)

2. Multiply this number by 2 (Just to be bold)

3. Add 5. (for Sunday)

4. Multiply it by 50 I'll wait while you get the calculator................

5. If you have already had your birthday this year add 1755....

If you haven't, add 1754 ....

6. Now subtract the four digit year that you were born.

You should have a three digit number

The first digit of this was your original number (i.e., how many times you want to have sex each week).

The next two numbers are .........

YOUR AGE! (Oh YES, it is!!!!!)

Squaring a 2-digit number beginning with 5 Take a 2-digit number beginning with 5. Square the first digit. Add this number to the second number to find the first part of the answer. Square the second digit: this is the last part of the answer. Example: If the number is 58 , multiply 5 × 5 = 25 (square the first digit). 25 + 8 = 33 (25 plus second digit). The first part of the answer is 33 3 3 _ _ 8 × 8 = 64 (square second digit). The last part of the answer is 64 _ _ 6 4 So 58 × 58 = 3364 . See the pattern? For 53 × 53, multiply 5 × 5 = 25 (square the first digit). 25 + 3 = 28 (25 plus second digit). The first part of the answer is 28 2 8 _ _ 3 × 3 = 9 (square second digit). The last part of the answer is 09 _ _ 0 9 So 53 × 53 = 2809 .

Take a 2-digit number beginning with 5.

Square the first digit.

Add this number to the second number to find the first part of the answer.

Square the second digit: this is the last part of the answer.

Example:

If the number is 58 , multiply 5 × 5 = 25 (square the first digit).

25 + 8 = 33 (25 plus second digit).

The first part of the answer is 33 3 3 _ _

8 × 8 = 64 (square second digit).

The last part of the answer is 64 _ _ 6 4

So 58 × 58 = 3364 .

See the pattern?

For 53 × 53, multiply 5 × 5 = 25 (square the first digit).

25 + 3 = 28 (25 plus second digit).

The first part of the answer is 28 2 8 _ _

3 × 3 = 9 (square second digit).

The last part of the answer is 09 _ _ 0 9

So 53 × 53 = 2809 .

Squaring a 2-digit number ending in 5 Choose a 2-digit number ending in 5. Multiply the first digit by the next consecutive number. The product is the first two digits: XX _ _. The last part of the answer is always 25: _ _ 2 5. Example: If the number is 35 , 3 × 4 = 12 (first digit times next number). 1 2 _ _ The last part of the answer is always 25: _ _ 2 5. So 35 × 35 = 1225 . See the pattern? For 65 × 65, 6 × 7 = 42 (first digit times next number): 4 2 _ _. The last part of the answer is always 25: _ _ 2 5. So 65 × 65 = 4225 .

Choose a 2-digit number ending in 5.

Multiply the first digit by the next consecutive number.

The product is the first two digits: XX _ _.

The last part of the answer is always 25: _ _ 2 5.

Example:

If the number is 35 , 3 × 4 = 12 (first digit times next number). 1 2 _ _

The last part of the answer is always 25: _ _ 2 5.

So 35 × 35 = 1225 .

See the pattern?

For 65 × 65, 6 × 7 = 42 (first digit times next number): 4 2 _ _.

The last part of the answer is always 25: _ _ 2 5.

So 65 × 65 = 4225 .

Squaring numbers made up of sixes Choose a a number made up of sixes. The square is made up of: one fewer 4 than there are repeating 6's 3 same number of 5's as 4's 6 Example: If the number to be squared is 666 The square of the number has: 4's (one less than digits in number) 4 4 3 3 5's (same number as 4's) 5 5 6 6 So 666 × 3666333 = 443556 . See the pattern? If the number to be squared is 66666 The square of the number has: 4's (one less than digits in number) 4 4 4 4 3 3 5's (same number as 4's) 5 5 5 5 6 6 So 66666 × 66666 = 4444355556 .

Choose a a number made up of sixes.

The square is made up of:

one fewer 4 than there are repeating 6's

3

same number of 5's as 4's

6

Example:

If the number to be squared is 666

The square of the number has: 4's (one less than digits in number) 4 4 3 3 5's (same number as 4's) 5 5 6 6

So 666 × 3666333 = 443556 .

See the pattern?

If the number to be squared is 66666

The square of the number has: 4's (one less than digits in number) 4 4 4 4 3 3 5's (same number as 4's) 5 5 5 5 6 6

So 66666 × 66666 = 4444355556 .

Multiply Up to 20X20 In Your Head In just FIVE minutes you should learn to quickly multiply up to 20x20 in your head. With this trick, you will be able to multiply any two numbers from 11 to 19 in your head quickly, without the use of a calculator. I will assume that you know your multiplication table reasonably well up to 10x10. Try this: Take 15 x 13 for an example. Always place the larger number of the two on top in your mind. Then draw the shape of Africa mentally so it covers the 15 and the 3 from the 13 below. Those covered numbers are all you need. First add 15 + 3 = 18 Add a zero behind it (multiply by 10) to get 180. Multiply the covered lower 3 x the single digit above it the "5" (3x5= 15) Add 180 + 15 = 195. That is It! Wasn't that easy? Practice it on paper first!

In just FIVE minutes you should learn to quickly multiply up to 20x20 in your head. With this trick, you will be able to multiply any two numbers from 11 to 19 in your head quickly, without the use of a calculator. I will assume that you know your multiplication table reasonably well up to 10x10.

Try this:

Take 15 x 13 for an example.

Always place the larger number of the two on top in your mind.

Then draw the shape of Africa mentally so it covers the 15 and the 3 from the 13 below. Those covered numbers are all you need.

First add 15 + 3 = 18

Add a zero behind it (multiply by 10) to get 180.

Multiply the covered lower 3 x the single digit above it the "5" (3x5= 15)

Add 180 + 15 = 195.

That is It! Wasn't that easy? Practice it on paper first!

The 11 Rule You likely all know the 10 rule (to multiply by 10, just add a 0 behind the number) but do you know the 11 rule? It is as easy! You should be able to do this one in you head for any two digit number. Practice it on paper first! To multiply any two digit number by 11: For this example we will use 54. Separate the two digits in you mind (5__4). Notice the hole between them! Add the 5 and the 4 together (5+4=9) Put the resulting 9 in the hole 594. That's it! 11 x 54=594 The only thing tricky to remember is that if the result of the addition is greater than 9, you only put the "ones" digit in the hole and carry the "tens" digit from the addition. For example 11 x 57 ... 5__7 ... 5+7=12 ... put the 2 in the hole and add the 1 from the 12 to the 5 in to get 6 for a result of 627 ... 11 x 57 = 627 Practice it on paper first!

You likely all know the 10 rule (to multiply by 10, just add a 0 behind the number) but do you know the 11 rule? It is as easy! You should be able to do this one in you head for any two digit number. Practice it on paper first! To multiply any two digit number by 11:

For this example we will use 54.

Separate the two digits in you mind (5__4).

Notice the hole between them!

Add the 5 and the 4 together (5+4=9)

Put the resulting 9 in the hole 594. That's it! 11 x 54=594

The only thing tricky to remember is that if the result of the addition is greater than 9, you only put the "ones" digit in the hole and carry the "tens" digit from the addition. For example 11 x 57 ... 5__7 ... 5+7=12 ... put the 2 in the hole and add the 1 from the 12 to the 5 in to get 6 for a result of 627 ... 11 x 57 = 627 Practice it on paper first!

Finger Math: 9X Rule To multiply by 9,try this: (1) Spread your two hands out and place them on a desk or table in front of you. (2) To multiply by 3, fold down the 3rd finger from the left. To multiply by 4, it would be the 4th finger and so on. (3) the answer is 27 ... READ it from the two fingers on the left of the folded down finger and the 7 fingers on the right of it. This works for anything up to 9x10!

To multiply by 9,try this: (1) Spread your two hands out and place them on a desk or table in front of you. (2) To multiply by 3, fold down the 3rd finger from the left. To multiply by 4, it would be the 4th finger and so on. (3) the answer is 27 ... READ it from the two fingers on the left of the folded down finger and the 7 fingers on the right of it. This works for anything up to 9x10!

Multiplication Tricks Multiply by 11 The eleven times table has always been very easy to learn up to 9 x 11. Here's a simple way of multiplying large numbers by 11 too. Let's try. Write down the first digit. Add the first and second digits. Write it. Add the second and third digits. Write it. Again and again do this. Write down the last digit. Example 1 - 425 x 11 First number = 4 4 + 2 = 6. 2 + 5 = 7 Last number = 5 The answer is 4675. Example 2 - 5890 x 11 First number = 5. 5 + 8 = 13. Now we can't write 13. So, add 1 into 5. Then write down 3. 8 + 9 = 17. Again add 1 into 3. Now it is 4. After that write down 7. 9 + 0 = 9. Then write down last digit. It is 0. Answer : 64790

Multiply by 11

The eleven times table has always been very easy to learn up to 9 x 11. Here's a simple way of multiplying large numbers by 11 too. Let's try.

Write down the first digit. Add the first and second digits. Write it. Add the second and third digits. Write it. Again and again do this. Write down the last digit.

Example 1 - 425 x 11

First number = 4 4 + 2 = 6. 2 + 5 = 7 Last number = 5 The answer is 4675.

Example 2 - 5890 x 11

First number = 5. 5 + 8 = 13. Now we can't write 13. So, add 1 into 5. Then write down 3. 8 + 9 = 17. Again add 1 into 3. Now it is 4. After that write down 7. 9 + 0 = 9. Then write down last digit. It is 0. Answer : 64790

Mind-Reading Number Trick Think of a number, any positive integer (but keep it small so you can do computations in your head). 1. Square it. 2. Add the result to your original number. 3. Divide by your original number. 4. Add, oh I don't know, say 17. 5. Subtract your original number. 6. Divide by 6. The number you are thinking of now is 3!

Think of a number, any positive integer (but keep it small so you can do computations in your head).

1. Square it. 2. Add the result to your original number. 3. Divide by your original number. 4. Add, oh I don't know, say 17. 5. Subtract your original number. 6. Divide by 6.

The number you are thinking of now is 3!

Be Good Have Nice day with the Math trick

Have Nice day with the Math trick

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