Solution - Long subtraction
0.599
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | ones | . | tenths | hundredths | thousandths |
| 8 | . | 2 | 9 | 9 | |
| - | 7 | . | 7 | ||
| . |
Put zeros in the blank number places:
| Place value | ones | . | tenths | hundredths | thousandths |
| 8 | . | 2 | 9 | 9 | |
| - | 7 | . | 7 | 0 | 0 |
| . |
2. Subtract the numbers using long subtraction method
Subtract the numbers in the thousandths column from the top number:
9-0=9
| Place value | ones | . | tenths | hundredths | thousandths |
| 8 | . | 2 | 9 | 9 | |
| - | 7 | . | 7 | 0 | 0 |
| . | 9 |
Subtract the numbers in the hundredths column from the top number:
9-0=9
| Place value | ones | . | tenths | hundredths | thousandths |
| 8 | . | 2 | 9 | 9 | |
| - | 7 | . | 7 | 0 | 0 |
| . | 9 | 9 |
Because the upper digit (2) in the tenths 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 (12).
| Place value | ones | . | tenths | hundredths | thousandths |
| 7 | 12 | ||||
| 8 | . | 2 | 9 | 9 | |
| - | 7 | . | 7 | 0 | 0 |
| . | 9 | 9 |
Subtract the numbers in the tenths column from the top number:
12-7=5
| Place value | ones | . | tenths | hundredths | thousandths |
| 7 | 12 | ||||
| 8 | . | 2 | 9 | 9 | |
| - | 7 | . | 7 | 0 | 0 |
| . | 5 | 9 | 9 |
Subtract the numbers in the ones column from the top number:
7-7=0
| Place value | ones | . | tenths | hundredths | thousandths |
| 7 | 12 | ||||
| 8 | . | 2 | 9 | 9 | |
| - | 7 | . | 7 | 0 | 0 |
| 0 | . | 5 | 9 | 9 |
The solution is: 0.599
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