Rounding/
Estimating
Area model
Partial Products
Standard Algorithm
Word Problems
100

#1 Don works 18 hours a week which expression shows a good way to use rounding to estimate how many hours Don will work in 52 weeks? 

a. 10 x 50 b. 10 x 60 c. 20 x 50 d. 18 x 60

c. 20 x 50

100

#6 Margo hiked 12 miles 13 times last month. She hiked 14 miles 12 miles this month. Draw area models to find the number of miles Margo hiked during the past two months. 

        10          3                  10          2

10  10x10     10x3.      10  10x10.    10x2

2    2 x 10    2x3.         4.   4x10.     4x2

100+30+20+6.                100+40+20+8

156.                                    168

156 +168=324

100

#26 What is the product 

  456

x  52

_____

23,712

100

#9 Check if Avery's work is reasonable. Correct the work if needed.

Missing place value holder. 

Actual Answer : 3,956

100

#2 There are 26 bottles of paint in one set. How many bottles of paint are in 52 sets?

1,352

200

#7 A florist makes centerpieces. He puts 18 roses in each centerpiece. Which is the best way to use compatible numbers to estimate the number of roses the florist needs for 24 centerpieces? What is the exact number of roses? 

b. 20 x 25 = 500 ; 432

200

# 22 Lorin drew an area model to find 19 x 15. Write the partial product for each rectangle in the area model. 

       10.       5

10.   A.        B

9.     C.       D. 

A. 10 x 10 = 100 

B. 10 x 5 = 50 

C. 9 x 10 = 90 

D. 9 x 5 = 45

200

# 27 A factory makes 132 laptops each day. How many laptops does the factory make in 45 days?

5,940 laptops

200

# 13 Find the product of 21 x 40. Show your work!

840

200
 # 4. Concert tickets cost $54 each. There are 448 seats in the theater. How much money does the theater collect from ticket sales for a sold-out show?

$24,192 

300

# 18 Select all products with an estimate close to 150,000. 

288 x 491 , 482 x 327, 313 x 507 , 368 x 642 , 

375 x 231

288 x 491 , 482 x 327, 313 x 507

300

# 25 Draw an area model to multiply 12 x 83 

        80.         3

10  10 x 80.   10 x 3 

2.   2 x 80      2 x 3

800 + 160 + 30 + 6 

= 996 

300

# 16 One box has 27 jars of strawberry jam. How many jars are in 82 boxes? 

2,214 jars

300

# 21 Use standard algorithm to find the product 

    86

x  68

______

5,848

300

#17 Which number makes the equation true? 

40 x ____ = 16,000

400

400

# 23 Which is the best estimate for 176 x 742? 

140,000

400

# 14 B. How many packages does Cargo Express deliver in a month? 

2,730 packages

400

# 14 A. How many packages does Transport Truck deliver in a month?

4,800 packages

400

#14 C. How many packages does Trusty Wheels deliver in a month? 

5,184 packages

400

#11 Jack's landscape service charges $78 to plant a tree. What is the total cost to plant 18 trees on Tuesday and 23 trees on Wednesday? Write and solve equations. 

78 x 18 = 1,404

78 x 23 = 1,794

500

# 10 Manuela goes to school 180 days this year. Each day, she spends 425 minutes at school. About how many minutes does Manuela spend at school this year?

80,000 minutes 

500

# 20 What is the product? 700 x 900

630,000

500

# 19 Antonio practices piano for 30 minutes each day. How many minutes does Antonio practice in 60 days? 

1,800 minutes

500
# 24 Find the product 23 x 54 

1,242

500

# 12 Which of the following uses properties of operations to help find 27 x 14? 

(20+7) x (10+4)

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