Solution - Long subtraction
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones | . | tenths | hundredths |
| 3 | 1 | . | 1 | ||
| - | 7 | . | 9 | 5 | |
| . |
Put zeros in the blank number places:
| Place value | tens | ones | . | tenths | hundredths |
| 3 | 1 | . | 1 | 0 | |
| - | 7 | . | 9 | 5 | |
| . |
2. Subtract the numbers using long subtraction method
Because the upper digit (0) in the hundredths column is too small to get a positive difference, borrow 1 from the digit (1) in the next number place which becomes (0) and get (10).
| Place value | tens | ones | . | tenths | hundredths |
| 0 | 10 | ||||
| 3 | 1 | . | 1 | 0 | |
| - | 7 | . | 9 | 5 | |
| . |
Subtract the numbers in the hundredths column from the top number:
10-0-5=5
| Place value | tens | ones | . | tenths | hundredths |
| 0 | 10 | ||||
| 3 | 1 | . | 1 | 0 | |
| - | 7 | . | 9 | 5 | |
| . | 5 |
Because the upper digit (0) in the tenths column is too small to get a positive difference, borrow 1 from the digit (1) in the next number place which becomes (0) and get (10).
| Place value | tens | ones | . | tenths | hundredths |
| 0 | 10 | ||||
| 0 | 10 | ||||
| 3 | 1 | . | 1 | 0 | |
| - | 7 | . | 9 | 5 | |
| . | 5 |
Subtract the numbers in the tenths column from the top number:
10-9=1
| Place value | tens | ones | . | tenths | hundredths |
| 0 | 10 | ||||
| 0 | 10 | ||||
| 3 | 1 | . | 1 | 0 | |
| - | 7 | . | 9 | 5 | |
| . | 1 | 5 |
Because the upper digit (0) in the ones 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 (10).
| Place value | tens | ones | . | tenths | hundredths |
| 2 | 10 | ||||
| 0 | 10 | ||||
| 0 | 10 | ||||
| 3 | 1 | . | 1 | 0 | |
| - | 7 | . | 9 | 5 | |
| . | 1 | 5 |
Subtract the numbers in the ones column from the top number:
10-7=3
| Place value | tens | ones | . | tenths | hundredths |
| 2 | 10 | ||||
| 0 | 10 | ||||
| 0 | 10 | ||||
| 3 | 1 | . | 1 | 0 | |
| - | 7 | . | 9 | 5 | |
| 3 | . | 1 | 5 |
Write 2 in the tens place.
| Place value | tens | ones | . | tenths | hundredths |
| 2 | 10 | ||||
| 0 | 10 | ||||
| 0 | 10 | ||||
| 3 | 1 | . | 1 | 0 | |
| - | 7 | . | 9 | 5 | |
| 2 | 3 | . | 1 | 5 |
The solution is: 23.15
How did we do?
Please leave us feedback.Why learn this
Why learn this