Solution - Long subtraction
124.1
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | hundreds | tens | ones | . | tenths |
| 1 | 2 | 9 | . | 1 | |
| - | 5 | ||||
| . |
Put zeros in the blank number places:
| Place value | hundreds | tens | ones | . | tenths |
| 1 | 2 | 9 | . | 1 | |
| - | 5 | . | 0 | ||
| . |
2. Subtract the numbers using long subtraction method
Subtract the numbers in the tenths column from the top number:
1-0=1
| Place value | hundreds | tens | ones | . | tenths |
| 1 | 2 | 9 | . | 1 | |
| - | 5 | . | 0 | ||
| . | 1 |
Subtract the numbers in the ones column from the top number:
9-5=4
| Place value | hundreds | tens | ones | . | tenths |
| 1 | 2 | 9 | . | 1 | |
| - | 5 | . | 0 | ||
| 4 | . | 1 |
Write 2 in the tens place.
| Place value | hundreds | tens | ones | . | tenths |
| 1 | 2 | 9 | . | 1 | |
| - | 5 | . | 0 | ||
| 2 | 4 | . | 1 |
Write 1 in the hundreds place.
| Place value | hundreds | tens | ones | . | tenths |
| 1 | 2 | 9 | . | 1 | |
| - | 5 | . | 0 | ||
| 1 | 2 | 4 | . | 1 |
The solution is: 124.1
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