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Multiplication with regrouping

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Information about Multiplication with regrouping
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Published on March 9, 2014

Author: mslauralozano

Source: authorstream.com

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Multiplication: Multiplication Objective : Multiply a 2-digit number by a 1-digit number. PowerPoint Presentation: Product The answer to a multiplication problem . Factor A number that is multiplied by another number to find a product . Ex: 4 x 6 = 24, 4 and 6 are factors of 24 Multiply - The act of finding the total number of items in a given number of groups when each group contains the same number of items . It is a short cut for addition. Array An arrangement that shows objects in rows and columns . Vocabulary * * * * * * * * * * * * 4 Example :       3 x 4 = 12 3 Vocabulary continued: Vocabulary continued Set -a group of items. Times - to multiply. Multiple - the product of a whole number and any other number Ex: the multiples of 3 are 3, 6, 9, 12, 15 . * * * * * * * * PowerPoint Presentation:  6 x 4 ------- 24 product What multiplication number sentence can we use to represent this set of squares? What word can we use to describe the arrangement of this set ? 6 and 4 are the factors in this problem Practice: Practice Demonstration http://www.dositey.com/muldiv/mul1ml1.htm Practice http://www.dositey.com/muldiv/mul1ss5.htm 12 22 31 42 x 3 x 4 x 4 x 3 36 88 124 126 Find the product . Multiplication with regrouping: Multiplication with regrouping 12 x 8 ------- PowerPoint Presentation:  1 2 x 8 ------- 6 1 Multiply the numbers in the ones place. Put the 6 in the ones place of the produc t . Regroup the 1 to the tens place. PowerPoint Presentation:  1 2 x 8 ------- 6 1 Multiply the tens place in the top number by the ones place in the bottom number. Then you take this number and add the 1. Put that answer in the tens place of the product . 9 Practice: Practice Demonstration w/regrouping http://www.dositey.com/muldiv/mul1ss5.htm Practice w/regrouping http://www.dositey.com/muldiv/mul1regss.htm 29 12 26 25 x 3 x 5 x 5 x 4 87 60 130 100 Find the product . Review the vocabulary:  Review the vocabulary Product Multiplier Multiply Factor Set Array Times Problem solving: Problem solving Ms. Rodriguez bought 4 bags of cookies. There are 17 cookies in each bag. How many cookies did Ms. Rodriguez buy? : Ms. Rodriguez bought 4 bags of cookies. There are 17 cookies in each bag. How many cookies did Ms. Rodriguez buy? 68 cookies 428 cookies 48 cookies 88 cookies The third grade classes had a Valentines Day party in the cafeteria. There were 25 tables with 7 seats at each table. How many seats were there in all? : The third grade classes had a Valentines Day party in the cafeteria. There were 25 tables with 7 seats at each table. How many seats were there in all? 1,435 seats 145 seats 125 seats 175 seats Maria’s mom made 8 packages of tamales. There are 12 tamales in each package. Which number sentence shows how many tamales Maria’s mom made? : Maria’s mom made 8 packages of tamales. There are 12 tamales in each package. Which number sentence shows how many tamales Maria’s mom made? 8 x 12 8 + 12 12 - 8 8 x 2 PowerPoint Presentation: A hexagon has six sides. Miguel drew 7 hexagons. How many sides did he draw? 6 sides 48 sides 42 sides 7 sides Hexagons 1 2 3 4 Sides 6 12 18 24 PowerPoint Presentation: The table shows how long it takes Alicia to ride her electric scooter. 60 minutes 80 minutes 10 minutes 75 minutes Miles Minutes 2 4 6 15 30 45 If this pattern continues, how many minutes will it take Alicia to ride 10 miles?

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