Solution - Long subtraction
7.9
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones | . | tenths |
| 1 | 0 | |||
| 0 | . | 2 | ||
| - | 1 | . | 9 | |
| . |
Put zeros in the blank number places:
| Place value | tens | ones | . | tenths |
| 1 | 0 | . | 0 | |
| 0 | . | 2 | ||
| - | 1 | . | 9 | |
| . |
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 2 from the number to the left (10) which becomes (08) and get (20).
| Place value | tens | ones | . | tenths |
| 0 | 20 | |||
| 1 | 0 | . | 0 | |
| 0 | . | 2 | ||
| - | 1 | . | 9 | |
| . |
Subtract the numbers in the tenths column from the top number:
20-0-2-9=9
| Place value | tens | ones | . | tenths |
| 0 | 20 | |||
| 1 | 0 | . | 0 | |
| 0 | . | 2 | ||
| - | 1 | . | 9 | |
| . | 9 |
Subtract the numbers in the ones column from the top number:
8-0-1=7
| Place value | tens | ones | . | tenths |
| 0 | 20 | |||
| 1 | 0 | . | 0 | |
| 0 | . | 2 | ||
| - | 1 | . | 9 | |
| 7 | . | 9 |
Write 0 in the tens place.
| Place value | tens | ones | . | tenths |
| 0 | 20 | |||
| 1 | 0 | . | 0 | |
| 0 | . | 2 | ||
| - | 1 | . | 9 | |
| 0 | 7 | . | 9 |
The solution is: 7.9
How did we do?
Please leave us feedback.Why learn this
Why learn this