Math Module 8

1

100

Multiply

16 x 43

688

200

The janitor sweeps 33 classrooms. There are 24 chairs in each classroom. How many chairs are there in all?

792

300

An area model shows 20 + 2 going across the top and 10 + 5 down the side. What two factors are  included in the area model? Choose two answers. 

A. 10

B. 12 

C. 15 

D. 20

E. 22

C. 15

E. 22

400

Mr. Blake drives 28 miles each day for 21 days. The last day he drives an additional 12 miles. Mr. Blake finds the number of miles he drives for 21 days. If Mr. Blake uses rounding to check whether his answer is reasonable, which equation does he use? 

A. 20 x 20 + 10 = 410

B. 30 x 20 + 10 = 610

C. 40 x 20 + 20 = 820

D. 30 x 30 + 20 = 920

B. 30 x 20 + 10 = 610

500

A school has 11 buses with 28 seats on each bus. There are 19 empty seats. 

Part A: What is the number of passengers on the buses? 

Part B: The principal wants to check whether the answer is reasonable. Which numbers should the principal use in an equation to find a reasonable estimate? Select three correct answers. 

A. 10 B. 20 C. 30 D. 40 E. 50 

Part A:

289 

Part B:

A. 10 B. 20 C. 30 

2

100

48 x 31

1,488

200

Brice is training for a bike race. He rides 72 miles a day for 12 days. How far does he ride?

864

300

Alexei sells 35 t-shirts for $18 each and 19 sweatshirts for $27 each at the school store. How much money does Alexei collect for t-shirts and sweatshirts?

$1,143

400

Henry and Jax are writing a comic book. Henry writes 12 pages for the comic book, and Natalie writes 16 pages. They want to make one copy for each of the 62 students in their grade. How many sheets of paper will Henry and Jax need for the 62 copies? 

1,736 sheets of paper

3

100

50 x 19

950

200

Use the Distributive Property to multiply. Complete the equation to find the product. 

18 x 40 = (__ x 40) + (8 x __) = 400 + ____ = ____

18 x 40 = (10 x 40) + (8 x 40) = 400 + 320 = 720