Multiply by Ten
Estimate Products
Box Method
Multiply With Regrouping
Problem Solving
100
60 X 20
What is 1,200
100
Estimate the product 63 X 19
What is 1,200
100

Find the product using the box method: 13 X 42

The partial products are 400, 120, 20, and 6. The product is 546.

100
48 X 38
What is 1,824
100

The 24 students in Ms. Reeves' class each collected an average of 18 cans for recycling. The 21 students in Mrs. Liss' class each collected an average of 25 cans for recycling. How many more cans were collected by Mrs. Liss' class than Ms. Reeves' class?

What is 93 more cans

200
10 X 90
What is 900
200
What is the best estimate for the product 43 X 68? A: 3,500 B: 2.800 C. 2,400 D: 280
What is B
200

Find the product using the box method: 15 X 24

The partial products are 200, 100, 40, and 20. The product is 360.

200
59 X 52
What is 3,068
200

At Broad School, each of the 45 classrooms has an average of 22 students. At West School, each of the 42 classrooms has an average of 23 students. How many more students are at Broad School than West School?

What is 24 more students

300
For the school play, 40 rows of chair are set up. There are 22 chairs in each row. How many chairs are there in all?
What is 880
300
Estimate the product of 78 X 21
What is 1,600
300

Each student in Ms. Reeves' 4th Grade class has a box of crayons. Each box has 36 crayons. If there are 18 students in Ms. Reeves' class, how many crayons are there in all? (Use the box method)

648 Crayons

300
91 X 19
What is 1,729
300

There are 26 baseball teams in the league. Each team has 18 players. Write a number sentence that will provide a reasonable estimate for the number of players in the league. 

What is 30 x 20= 600

400
At West School, there are 20 classrooms. Each classroom has 20 students. How many students are at West School?
What is 400
400
A half-dollar has a diameter of about 31 millimeters. About how many millimeters long would a row of 56 half-dollars be?
What is about 1,800 millimeters
400

Solve using the box method: 16 X 19

The partial products are 100, 40, 60, and 24. The product is 224.

400

86 x 24 

What is 2,064

400

There are 23 boxes of pencils in Mr. Pettit's supply cabinet. Each box contains 100 pencils. How many pencils are in the supply cabinet?

What is 2,300

500
Kenny bought 20 packs of baseball cards. There are 12 cards in each pack. How many cards did Kenny buy?
What is 240 Cards
500
How could you estimate the product 253 X 93? (Explain and find the estimated product)
I would round 253 to the nearest hundred and round 93 to the nearest ten. 300 X 90 = 27,000
500

Solve using the box method: 23 X 25

The partial products are 400, 100, 60, and 15. The product is 575.

500

46 x 58 

What is 2,668

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