G4 Math Multilplication -p.212

G4 Math Multiplication -p.212

Open Ended

9. Why can the calculation in red be thought of as simpler problems?

9.)

Ans: It is easier to multiply with 1-digit numbers and multiples of 10.

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Open Ended

10. Explain the mistakes in the calculation below. Show the correct calculation.

10.)

Ans. Two partial products are wrong.

3 x 10 = 30, not 3.

10 x 10 = 100, not 10

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Ans. Two partial products are wrong.

12 x 13

3 x 2 = 6

3 x 10 =30

10 x 2 = 20

10 x 10 =100

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11. A movie theater charges $10 for an adult ticket and $9 for a child ticket. The goal is to make $1,200 on adult tickets each week. Did the theater make its goal this week?

How much more or less than the goal did the theater make?

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Fill in the Blanks

11.

$10 -adult ticket

Goal : $1,200 on adult tickets each week

Did the theater make its goal this week?

How much more or less than the goal did the theater make?

11. )

Goal: $1,200

(Mon-Fri ) 13 + 18 + 15 +10 + 17=73

Ans: No; They made $730, which is $470 less than the goal.

73 x $10 = $730 ; $1,200 - $730 = $470

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12. A golf practice range has 245 balls. The owner bought a carton of golf balls. How many golf balls does the owner have after buying?

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Open Ended

12. A golf practice range has 245 balls. The owner bought a carton of golf balls. How many golf balls does the owner have after buying?

12.)

Ans. 1,145 golf balls

12 x 15 x 5 = 900 ; 900 +245 =1,145

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Partial Products-Review

(HW)

Multiple Select

13. Select all the partial products needed to find the final product.

• 8

• 80

• 100

• 180

• 600

13.) Partial Products

12 x 18

8 x 2 = 16

8 x 10 = 80

10 x 2 = 20

10 x 10 = 100

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Multiple Select

14. Select all the partial products needed to find the final product.

• 7

• 70

• 280

• 700

• 2,800

14.) Partial Products

41 x 77

7 x 1 = 7

7 x 40 = 280

70 x 1 = 70

70 x 40 = 2,800

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