Mastering Two-Digit Multiplication Techniques

Mr. Pearson teaches how to decompose numbers to simplify multiplication of one-digit by two-digit numbers. He uses examples like 8 times 24, decomposing 24 into 20 and 4, and provides alternative methods. Practice problems include calculating Caitlyn's weekly Naruto episodes, Breezy's earnings, and soccer practice time, all using decomposition.

What is the first step in decomposing 24 for multiplication?

• Breaking it into 10 and 14

• Breaking it into 15 and 9

• Breaking it into 12 and 12

• Breaking it into 20 and 4

Tags

CCSS.4.NBT.B.5

How do you solve 8 times 20?

• By adding 8 twenty times

• By multiplying 8 by 10 and then doubling the result

• By multiplying 8 by 2 and then adding a zero

• By dividing 8 by 2 and then multiplying by 40

Tags

CCSS.3.NBT.A.3

What is the result of 8 times 24 when decomposed into 20 and 4?

• 192

• 160

• 180

• 200

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CCSS.4.NBT.B.5

Which of the following is an alternative way to decompose 24?

• 10 and 14

• 18 and 6

• 12 and 12

• 15 and 9

How many episodes of Naruto does Caitlyn watch in a week if she watches 4 episodes a day?

• 30

• 32

• 28

• 24

Tags

CCSS.3.OA.A.3

How can you decompose 7 for multiplication in the Naruto example?

• Into 6 and 1

• Into 5 and 2

• Into 4 and 3

• Into 3 and 4

Tags

CCSS.3.OA.C.7

How much does Breezy earn in 10 hours if she makes $9 an hour?

• $110

• $100

• $90

• $80

Tags

CCSS.6.RP.A.3B

What is the total amount Breezy earns after working 12 hours?

• $108

• $120

• $100

• $110

Tags

CCSS.3.OA.A.3

How many minutes does someone practice soccer in a week if they practice 45 minutes a day?

• 330

• 320

• 300

• 315

Tags

CCSS.3.OA.A.3

How can you decompose 45 for multiplication in the soccer practice example?

• Into 35 and 10

• Into 25 and 20

• Into 30 and 15

• Into 40 and 5

Tags

CCSS.3.OA.C.7