Divisibility

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Information about Divisibility
Education

Published on March 23, 2014

Author: swdeshmishra

Source: authorstream.com

DIVISIBILITY OF 2: DIVISIBILITY OF 2 If the unit digit of a number is one of 0,2,4,6,8 the number is divisible by 2 . DIVISIBILITY TEST: DIVISIBILITY TEST Under this topic we learn whether a number is divisible by a particular number or not . EXAMPLES: EXAMPLES 1) 20,32,74,86 and 98 are divisible by 2 , as they have 0,2,4,6 or 8 at their ones place. 2) 21,33,75,87,89 are not divisible by 2. DIVISIBILITY OF 3: DIVISIBILITY OF 3 If the sum of the digits of a number is divisible by 3 , the number is divisible by 3. EXAMPLES: EXAMPLES 1) Considering the number 78 Sum of the digits = 7+ 8 =15 (divisible by 3) Hence 78 is divisible by 3 2- Considering the number 97, Sum of the digits =9+7=16 (not divisible by 3) Hence 97 is not divisible by 3 . DIVISIBILITY OF 5: DIVISIBILITY OF 5 If the units digit of a number is either 0 or 5, the number is divisible by 5. EXAMPLES: EXAMPLES 1- 70 and 85 are divisible by 5 as their ones digit is 0 and 5. 2- 71 ,72 ,83, etc. are not divisible by 5 as they do not have 0 or 5 at their ones place. DIVISIBILITY OF 10: DIVISIBILITY OF 10 If the units digit of a number 0, the number is divisible by 10. EXAMPLES: EXAMPLES 1- 20,30,40…..90 are divisible by 10 , as their ones digit is 0. What we have learnt ?: What we have learnt ? If the unit digit of a number is one of 0,2,4,6,8 the number is divisible by 2 . If the sum of the digits of a number is divisible by 3 , the number is divisible by 3. If the units digit of a number is either 0 or 5, the number is divisible by 5. If the units digit of a number 0, the number is divisible by 10. If the sum of the digits of a number is If the units digit of a number is either 0 or 5, the number is divisible by 5. CHECK YOUR KNOWLEDGE: CHECK YOUR KNOWLEDGE SAY EITHER “YES” OR “NO” 1- Is 164 divisible by 2 ? 2- Is 275 divisible by 2 ? 3- Is 375 divisible by 3 ? 4- Is 278 divisible by 5 ? 5- Is 300 divisible by 10 ? Q1:  Q1 SAY EITHER “YES” OR “NO” 1- Is 164 divisible by 2 ? YES NO

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