Solution - Long subtraction
81.88
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones | . | tenths | hundredths |
| 8 | 5 | ||||
| - | 3 | . | 1 | 2 | |
| . |
Put zeros in the blank number places:
| Place value | tens | ones | . | tenths | hundredths |
| 8 | 5 | . | 0 | 0 | |
| - | 3 | . | 1 | 2 | |
| . |
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 number to the left (5.0) which becomes (4.9) and get (10).
| Place value | tens | ones | . | tenths | hundredths |
| 4 | 9 | 10 | |||
| 8 | 5 | . | 0 | 0 | |
| - | 3 | . | 1 | 2 | |
| . |
Subtract the numbers in the hundredths column from the top number:
10-0-2=8
| Place value | tens | ones | . | tenths | hundredths |
| 4 | 9 | 10 | |||
| 8 | 5 | . | 0 | 0 | |
| - | 3 | . | 1 | 2 | |
| . | 8 |
Subtract the numbers in the tenths column from the top number:
9-1=8
| Place value | tens | ones | . | tenths | hundredths |
| 4 | 9 | 10 | |||
| 8 | 5 | . | 0 | 0 | |
| - | 3 | . | 1 | 2 | |
| . | 8 | 8 |
Subtract the numbers in the ones column from the top number:
4-3=1
| Place value | tens | ones | . | tenths | hundredths |
| 4 | 9 | 10 | |||
| 8 | 5 | . | 0 | 0 | |
| - | 3 | . | 1 | 2 | |
| 1 | . | 8 | 8 |
Write 8 in the tens place.
| Place value | tens | ones | . | tenths | hundredths |
| 4 | 9 | 10 | |||
| 8 | 5 | . | 0 | 0 | |
| - | 3 | . | 1 | 2 | |
| 8 | 1 | . | 8 | 8 |
The solution is: 81.88
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