Solution - Long subtraction
12.9
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones | . | tenths |
| 1 | 3 | . | 8 | |
| - | 0 | . | 9 | |
| . |
2. Subtract the numbers using long subtraction method
Because the upper digit (8) in the tenths column is too small to get a positive difference, borrow 1 from the digit (3) in the next number place which becomes (2) and get (18).
| Place value | tens | ones | . | tenths |
| 2 | 18 | |||
| 1 | 3 | . | 8 | |
| - | 0 | . | 9 | |
| . |
Subtract the numbers in the tenths column from the top number:
18-9=9
| Place value | tens | ones | . | tenths |
| 2 | 18 | |||
| 1 | 3 | . | 8 | |
| - | 0 | . | 9 | |
| . | 9 |
Subtract the numbers in the ones column from the top number:
2-0=2
| Place value | tens | ones | . | tenths |
| 2 | 18 | |||
| 1 | 3 | . | 8 | |
| - | 0 | . | 9 | |
| 2 | . | 9 |
Write 1 in the tens place.
| Place value | tens | ones | . | tenths |
| 2 | 18 | |||
| 1 | 3 | . | 8 | |
| - | 0 | . | 9 | |
| 1 | 2 | . | 9 |
The solution is: 12.9
How did we do?
Please leave us feedback.Why learn this
Why learn this