Solution - Long subtraction
87.8
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | hundreds | tens | ones | . | tenths |
| 1 | 0 | 0 | |||
| - | 1 | 2 | . | 2 | |
| . |
Put zeros in the blank number places:
| Place value | hundreds | tens | ones | . | tenths |
| 1 | 0 | 0 | . | 0 | |
| - | 1 | 2 | . | 2 | |
| . |
2. Subtract the numbers using long subtraction method
Because the upper digit (0) in the tenths column is too small to get a positive difference, borrow 1 from the number to the left (100) which becomes (099) and get (10).
| Place value | hundreds | tens | ones | . | tenths |
| 0 | 9 | 10 | |||
| 1 | 0 | 0 | . | 0 | |
| - | 1 | 2 | . | 2 | |
| . |
Subtract the numbers in the tenths column from the top number:
10-0-2=8
| Place value | hundreds | tens | ones | . | tenths |
| 0 | 9 | 10 | |||
| 1 | 0 | 0 | . | 0 | |
| - | 1 | 2 | . | 2 | |
| . | 8 |
Subtract the numbers in the ones column from the top number:
9-2=7
| Place value | hundreds | tens | ones | . | tenths |
| 0 | 9 | 10 | |||
| 1 | 0 | 0 | . | 0 | |
| - | 1 | 2 | . | 2 | |
| 7 | . | 8 |
Subtract the numbers in the tens column from the top number:
9-1=8
| Place value | hundreds | tens | ones | . | tenths |
| 0 | 9 | 10 | |||
| 1 | 0 | 0 | . | 0 | |
| - | 1 | 2 | . | 2 | |
| 8 | 7 | . | 8 |
Write 0 in the hundreds place.
| Place value | hundreds | tens | ones | . | tenths |
| 0 | 9 | 10 | |||
| 1 | 0 | 0 | . | 0 | |
| - | 1 | 2 | . | 2 | |
| 0 | 8 | 7 | . | 8 |
The solution is: 87.8
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