Grade 4 - Progress in Mathematics

Estimate in Division

5-5

Write an X in the place where the quotient begins.

X

1. 4
    7  6  2. 6
    4  8  3. 2
    4  5  1  4. 7
    9  2  7  5. 8
    7  4  5 


2. 3
    1  2  7  7. 5
    3  7  0  8. 2
    1  4  6  8  9. 7
    4  3  0  3 

Yo u can estimate quotients before you divide.

Estimate: 2832 
8.


Find where the quotient begins.

Tr y dividing thousands.

8 
 2  8  3  2  8  2 Not enough thousands

Tr y dividing hundreds.

8 
 2  8  3  2  8  28 Enough hundreds

So the quotient begins in the hundreds place. 8 
 2  8  3  2 

Find the first digit of the quotient.

Think of a basic multiplication fact with 8 and a number

whose product is close to 28, but not greater than 28.

2  8 16 too small 28 is between

3  8  24 16 and 32. 3

4  8 32 too large Tr y 3. 8 
 2  8  3  2 

Write 3 in the hundreds place.

Since you are estimating, about 3 00

write zeros for the other digits. 8 
 2  8  3  2 

Study these examples.

about 200 about 70 about $ 6.00

2 
 5  2  3  6 
 4  2  5  5 
$ 32 .7 5 

hundreds

place

8204-6_172-173 10/11/07 3:23 PM Page 172