Bridges Grade 3 Unit 2 Review

Multiplication Equations

100

10 x 3 = 

30

200

2 x 6 = 

12

300

4 x 5 = 

20

400

7 x 7 = 

49

500

28 = ____ x 4

7

Arrays & Pictures

100

(see slides) How many dots are there? How do you know? (think of an equation you used to find the answer)

30 dots

200

(see slides) How much do the stamps cost in total? 

18 cents

300

(see slides) How many windowpanes are in the window? How do you know? 

28 windowpanes

400

Write a multiplication equation to find how much the dog food would cost in total.  

8 x 10 = 80

The dog food would cost $80. 

500

If the small fish is 4 centimeters long, about how long is the big fish? How do you know? Explain your thinking.

about 12 centimeters long

Balancing Equations

100

True or false: 

2 + 5 = 5 + 2

True

200

True or false: 2 x 6 = 4 x 4

False

300

Fill in the blanks: 

9 x 7 = 7 x ____

9

400

Fill in the blanks: 

3 x 4 = 2 x ____

6

500

Fill in the blanks:

___ x 4 = 2 x 12

6

Word Problems

100

There are 2 cans of dog food for $4 each. How much do the cans cost all together? 

$8

200

A cat collar costs $3. How much do five collars cost altogether? 

$15

300

Four dog bones cost a total of $16. How much does each collar cost? 

$4

400

The coral is 30 centimeters long. The stingray is 6 times as long as the coral. Which equation would you use to find out how long the stingray is? (The letter s stands for the length of the stingray.) 

A. 30 + 6 = s

B. 30 x 6 = s

C. 30 - 6 = s

D. 30 x s = 6

B. 30 x 6 = s

500

Two parts: Four bags of bird seed cost $20. 

A. How much does one bag cost? 

B. Write a division equation for this problem. 

A. $5

B. 20 / 4 = 5

Miscellaneous

100

When you multiply two factors together, you get a ________. (hint: the answer the a multiplication problem)

product 

200

Draw an array (bracelets and beads) for the following equation: 

3 x 7 

(see student work)

300

Laryssa says "I found 4 x 6 is 12 because I doubled from 2 x 3 = 6." Do you agree with Laryssa? Why or why not? 

(must explain to get full credit) 

No, I don't agree. You only double one factor when using the doubling strategy. 

4 x 6 = 24

You can't double both factors. 

400

Explain how you can use 2 x 5 to find 4 x 5. 

You can use the doubling strategy. Since 4 is double 2 (2 + 2 = 4) then you can just double the product. 

2 x 5 = 10

4 x 5 = ____

Double of 10 (10+10) = 20

So 4 x 5 = 20

500

(see slides) Fill in the missing numbers of cars and tires in the ratio table.

8, 4, 24, 7