Subtraction with Multiple Regrouping

Problem 1

Subtract 836 647

Solution

Step 1:

Line up the numbers vertically.

Step 2:

In ones column, 7 is bigger than 6. So we borrow from 3 in tens column. We cross out 3 and write a 2. We put borrowed 1 beside 6 to make it 16. Then we subtract 7 from 16 to get 9.

Step 3:

In tens column, 4 is bigger than 2. So we borrow from left. We cross out 8 and write a 7. We put borrowed 1 beside 2 to make it 12. Then we subtract 12 4 = 8.

Step 4:

In hundreds column, we subtract 7 6 = 1. So final answer is 189

Problem 2

Subtract 658 379

Solution

Step 1:

Line up the numbers vertically.

Step 2:

In ones column, 9 is bigger than 8. So we borrow from 5 in tens column. We cross out 5 and write a 4. We put borrowed 1 beside 8 to make it 18. We then subtract 18 9 = 9.

Step 3:

In tens column, 7 is bigger than 4. So we borrow from left. We cross out 6 and write a 5. We put borrowed 1 beside 4 to make it 14. We then subtract 14 7 = 7.

Step 4:

In hundreds column, we subtract 5 3 = 2. So final answer is 279