Solution - Long subtraction
1.55
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones | . | tenths | hundredths |
| 1 | 0 | . | 2 | 5 | |
| - | 8 | . | 7 | ||
| . |
Put zeros in the blank number places:
| Place value | tens | ones | . | tenths | hundredths |
| 1 | 0 | . | 2 | 5 | |
| - | 8 | . | 7 | 0 | |
| . |
2. Subtract the numbers using long subtraction method
Subtract the numbers in the hundredths column from the top number:
5-0=5
| Place value | tens | ones | . | tenths | hundredths |
| 1 | 0 | . | 2 | 5 | |
| - | 8 | . | 7 | 0 | |
| . | 5 |
Because the upper digit (2) in the tenths column is too small to get a positive difference, borrow 1 from the number to the left (10) which becomes (09) and get (12).
| Place value | tens | ones | . | tenths | hundredths |
| 0 | 12 | ||||
| 1 | 0 | . | 2 | 5 | |
| - | 8 | . | 7 | 0 | |
| . | 5 |
Subtract the numbers in the tenths column from the top number:
12-7=5
| Place value | tens | ones | . | tenths | hundredths |
| 0 | 12 | ||||
| 1 | 0 | . | 2 | 5 | |
| - | 8 | . | 7 | 0 | |
| . | 5 | 5 |
Subtract the numbers in the ones column from the top number:
9-8=1
| Place value | tens | ones | . | tenths | hundredths |
| 0 | 12 | ||||
| 1 | 0 | . | 2 | 5 | |
| - | 8 | . | 7 | 0 | |
| 1 | . | 5 | 5 |
Write 0 in the tens place.
| Place value | tens | ones | . | tenths | hundredths |
| 0 | 12 | ||||
| 1 | 0 | . | 2 | 5 | |
| - | 8 | . | 7 | 0 | |
| 0 | 1 | . | 5 | 5 |
The solution is: 1.55
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