Solution - Long subtraction
7.82
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | ones | . | tenths | hundredths |
| 9 | . | 0 | 2 | |
| - | 1 | . | 2 | |
| . |
Put zeros in the blank number places:
| Place value | ones | . | tenths | hundredths |
| 9 | . | 0 | 2 | |
| - | 1 | . | 2 | 0 |
| . |
2. Subtract the numbers using long subtraction method
Subtract the numbers in the hundredths column from the top number:
2-0=2
| Place value | ones | . | tenths | hundredths |
| 9 | . | 0 | 2 | |
| - | 1 | . | 2 | 0 |
| . | 2 |
Because the upper digit (0) 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 (10).
| Place value | ones | . | tenths | hundredths |
| 8 | 10 | |||
| 9 | . | 0 | 2 | |
| - | 1 | . | 2 | 0 |
| . | 2 |
Subtract the numbers in the tenths column from the top number:
10-2=8
| Place value | ones | . | tenths | hundredths |
| 8 | 10 | |||
| 9 | . | 0 | 2 | |
| - | 1 | . | 2 | 0 |
| . | 8 | 2 |
Subtract the numbers in the ones column from the top number:
8-1=7
| Place value | ones | . | tenths | hundredths |
| 8 | 10 | |||
| 9 | . | 0 | 2 | |
| - | 1 | . | 2 | 0 |
| 7 | . | 8 | 2 |
The solution is: 7.82
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