Solution - Long subtraction
0.61
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones | . | tenths | hundredths |
| 1 | 8 | . | 1 | 1 | |
| - | 1 | 7 | . | 5 | |
| . |
Put zeros in the blank number places:
| Place value | tens | ones | . | tenths | hundredths |
| 1 | 8 | . | 1 | 1 | |
| - | 1 | 7 | . | 5 | 0 |
| . |
2. Subtract the numbers using long subtraction method
Subtract the numbers in the hundredths column from the top number:
1-0=1
| Place value | tens | ones | . | tenths | hundredths |
| 1 | 8 | . | 1 | 1 | |
| - | 1 | 7 | . | 5 | 0 |
| . | 1 |
Because the upper digit (1) in the tenths column is too small to get a positive difference, borrow 1 from the digit (8) in the next number place which becomes (7) and get (11).
| Place value | tens | ones | . | tenths | hundredths |
| 7 | 11 | ||||
| 1 | 8 | . | 1 | 1 | |
| - | 1 | 7 | . | 5 | 0 |
| . | 1 |
Subtract the numbers in the tenths column from the top number:
11-5=6
| Place value | tens | ones | . | tenths | hundredths |
| 7 | 11 | ||||
| 1 | 8 | . | 1 | 1 | |
| - | 1 | 7 | . | 5 | 0 |
| . | 6 | 1 |
Subtract the numbers in the ones column from the top number:
7-7=0
| Place value | tens | ones | . | tenths | hundredths |
| 7 | 11 | ||||
| 1 | 8 | . | 1 | 1 | |
| - | 1 | 7 | . | 5 | 0 |
| 0 | . | 6 | 1 |
Subtract the numbers in the tens column from the top number:
1-1=0
| Place value | tens | ones | . | tenths | hundredths |
| 7 | 11 | ||||
| 1 | 8 | . | 1 | 1 | |
| - | 1 | 7 | . | 5 | 0 |
| 0 | 0 | . | 6 | 1 |
The solution is: 0.61
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