Solution - Long subtraction
3.12
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | ones | . | tenths | hundredths |
| 3 | . | 2 | ||
| - | 0 | . | 0 | 8 |
| . |
Put zeros in the blank number places:
| Place value | ones | . | tenths | hundredths |
| 3 | . | 2 | 0 | |
| - | 0 | . | 0 | 8 |
| . |
2. Subtract the numbers using long subtraction method
Because the upper digit (0) in the hundredths column is too small to get a positive difference, borrow 1 from the digit (2) in the next number place which becomes (1) and get (10).
| Place value | ones | . | tenths | hundredths |
| 1 | 10 | |||
| 3 | . | 2 | 0 | |
| - | 0 | . | 0 | 8 |
| . |
Subtract the numbers in the hundredths column from the top number:
10-0-8=2
| Place value | ones | . | tenths | hundredths |
| 1 | 10 | |||
| 3 | . | 2 | 0 | |
| - | 0 | . | 0 | 8 |
| . | 2 |
Subtract the numbers in the tenths column from the top number:
1-0=1
| Place value | ones | . | tenths | hundredths |
| 1 | 10 | |||
| 3 | . | 2 | 0 | |
| - | 0 | . | 0 | 8 |
| . | 1 | 2 |
Subtract the numbers in the ones column from the top number:
3-0=3
| Place value | ones | . | tenths | hundredths |
| 1 | 10 | |||
| 3 | . | 2 | 0 | |
| - | 0 | . | 0 | 8 |
| 3 | . | 1 | 2 |
The solution is: 3.12
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