6th Grade Math Textbook, Progress

5

Operations I

Add Whole Numbers and Decimals

Add: 8164
 4676 .

First estimate by rounding: 8000
 5000 13,000. Then add.

To add whole numbers:

Add the ones. Add the tens. Add the Add the thousands.

Regroup. Regroup. hundreds. Regroup.

11111 1 1


8 1 6 4 
8 1 6 4 
8 1 6 4 
 0 8 ,1 6 4


4 6 7 6 
4 6 7 6 
4 6 7 6 
 0 4 ,6 7 6


0 0 0 0 
0 0 4 0 
0 8 4 0 1 2,8 4 0

The sum is 12,840.

?

Think

12,840 is close to the

estimate of 13,000.

Think

1.59 is close to the

estimate of 1.6.

Add: 0.44
0.3
0.85.

First estimate by rounding to the nearest tenth: 0.4
0.3
0.91.6. Then add.

To add decimals:

Line up the Add. Regroup Write the

decimal points. if necessary. decimal point.

1 1


0.4 4 
0.4 4 
0.4 4


0.3 0 
0.3 0 
0.3 0


0.8 5 
0.8 5 
0.8 5


1.59 
 1. 59

The sum is 1.59.

?

Estimate by rounding. Then add.

1. 
   536 2.
   1578 3.
   1768 4.
   17,243 5.
   567,892
   
   143
   6421
   0063
   13,963
   132,104

Align and estimate by rounding. Then add.

6. 5751
   756 7. 0.56
   0.41 8. 0.8
   0.47 9. $9.78
   $43.85
   $5

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