Chapter 3
1. Multiply
40 x 30 = _________
Use place value to explain how you
know your answer is correct.
2. Circle the best estimate for 35 x 52
a. 40 x 50 = 2,000
b. 30 x 50 = 1,500
c. 30 x 60 = 1,800
d. 40 x 60 = 2,400
3. Multiply. Show your thinking
32 x 18=
300
240
20
16
4. Multiply. Show your thinking
45 x 26=
5. Laura made this model to find the
product of 45 and 51. Circle the
error.
200
250
40
5
6. Solve the problem correctly.
800
320
120
48
7. Find the unknown digits and
solve the problem.
8. Find the unknown digits and solve the problem.
9. Mr. Wulbecker has $180 to buy 20 books for the library. If each book
costs $13, how much more money does he need to buy the books?
10. Joe has 26 shelves in his library. Each shelf has
13 books. He orders 32 more books. Write an
equation that best estimates about how many books
he will have.
30 x 10 + 30 = b
300 + 30 = b
330
=b
So the equation is 30 x 10 + 30 = 330
11. A college has a building with 4 floors. Each floor has 17
rooms with 35 seats in each room. Without actually solving,
how do you know that building has at least 3,000 seats?
4 floors x 20 rooms = about 80 rooms
80 rooms x 40 seats = about 3,200 seats
I estimated that there are about 80 rooms
with about 40 seats per room. This is 3,200
seats, which is more than 3,000.
12. Diego has 32 Legos. He buys 6 more packages with 15
Legos in each package. Diego gives 20 Legos to his friend
Edgar. How many Legos does he have now?
Step 3: subtract the
Step 1: How many Step 2: add the Legos
Legos that he gave to
Legos did he buy? that he bought to the
Edgar.
ones that he already
3
had.
15
122
90
x 6
- 20
+ 32
------------------------90
102
122
Diego has 102 Legos left
You will rock the
chapter 3 test!!!!