Partial-Differences Subtraction Method

 

1. Subtract from left to right, one column at a time.

 

2. Always subtract the smaller number from the larger number:

 

         If the smaller number is on the top, include a minus sign before the difference. Subtract the difference from the answer.

 

3. Add up the answers from each column.

 

Example: 759 384 =

 

 

 

 

7

5

9

 

 

 

-

3

8

4

 

 

 

 

 

 

 

 

Subtract the 100s

700 - 300

+

4

0

0

 

Subtract the 10s

50 - 80

-

 

3

0

*

Subtract the 1s

9 - 4

+

 

 

5

 

 

 

 

 

 

 

 

Find the total

400 30 + 5

 

3

7

5

 

 

* Remember to include a minus sign if the smaller number (50) is on top.