Solution - Long subtraction
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | ones | . | tenths | hundredths | thousandths |
| 9 | . | 8 | 7 | ||
| - | 0 | . | 9 | 8 | 7 |
| . |
Put zeros in the blank number places:
| Place value | ones | . | tenths | hundredths | thousandths |
| 9 | . | 8 | 7 | 0 | |
| - | 0 | . | 9 | 8 | 7 |
| . |
2. Subtract the numbers using long subtraction method
Because the upper digit (0) in the thousandths column is too small to get a positive difference, borrow 1 from the digit (7) in the next number place which becomes (6) and get (10).
| Place value | ones | . | tenths | hundredths | thousandths |
| 6 | 10 | ||||
| 9 | . | 8 | 7 | 0 | |
| - | 0 | . | 9 | 8 | 7 |
| . |
Subtract the numbers in the thousandths column from the top number:
10-0-7=3
| Place value | ones | . | tenths | hundredths | thousandths |
| 6 | 10 | ||||
| 9 | . | 8 | 7 | 0 | |
| - | 0 | . | 9 | 8 | 7 |
| . | 3 |
Because the upper digit (6) in the hundredths column is too small to get a positive difference, borrow 1 from the digit (8) in the next number place which becomes (7) and get (16).
| Place value | ones | . | tenths | hundredths | thousandths |
| 7 | 16 | ||||
| 6 | 10 | ||||
| 9 | . | 8 | 7 | 0 | |
| - | 0 | . | 9 | 8 | 7 |
| . | 3 |
Subtract the numbers in the hundredths column from the top number:
16-8=8
| Place value | ones | . | tenths | hundredths | thousandths |
| 7 | 16 | ||||
| 6 | 10 | ||||
| 9 | . | 8 | 7 | 0 | |
| - | 0 | . | 9 | 8 | 7 |
| . | 8 | 3 |
Because the upper digit (7) in the tenths column is too small to get a positive difference, borrow 1 from the digit (9) in the next number place which becomes (8) and get (17).
| Place value | ones | . | tenths | hundredths | thousandths |
| 8 | 17 | ||||
| 7 | 16 | ||||
| 6 | 10 | ||||
| 9 | . | 8 | 7 | 0 | |
| - | 0 | . | 9 | 8 | 7 |
| . | 8 | 3 |
Subtract the numbers in the tenths column from the top number:
17-9=8
| Place value | ones | . | tenths | hundredths | thousandths |
| 8 | 17 | ||||
| 7 | 16 | ||||
| 6 | 10 | ||||
| 9 | . | 8 | 7 | 0 | |
| - | 0 | . | 9 | 8 | 7 |
| . | 8 | 8 | 3 |
Subtract the numbers in the ones column from the top number:
8-0=8
| Place value | ones | . | tenths | hundredths | thousandths |
| 8 | 17 | ||||
| 7 | 16 | ||||
| 6 | 10 | ||||
| 9 | . | 8 | 7 | 0 | |
| - | 0 | . | 9 | 8 | 7 |
| 8 | . | 8 | 8 | 3 |
The solution is: 8.883
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