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Practice Using Estimation and Area Models to Divide
Study the Example showing how to estimate and use area
models to divide. Then solve problems 1-4.
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EXAMPLE
A donut shop sells donuts in boxes that each contain 13 donuts
If 728 donuts were sold in one day, how many boxes of donuts were sold?
Multiply 13 by multiples of 10 to help you estimate the quotient. Make a table.
Number of boxes
Number of donuts
Because 728 is between 650 and 780, the quotient is between 50 and 60.
Use 50 as the first partial quotient in an area model for 728-13.
50
20
260
13
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30
390
(13 x 50-650)
d. What is the second partial quotient?
40
520
650
78
72813-56. The donut shop sold 56 boxes of donuts.
10.4 TAKE-HOME
4
LESSONS SESSION 3
50
650
6
60
780
(13×6-78)
78
The area model in the Example shows how to break apart the problem 728 + 13
into parts.
a. What was 13 multiplied by first?..10........
b. What equation in the area model shows this?
c. Why do you subtract 650 from 728?
56
91