Solution - Long subtraction
1.68
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | ones | . | tenths | hundredths |
| 3 | . | 1 | 8 | |
| - | 1 | . | 5 | |
| . |
Put zeros in the blank number places:
| Place value | ones | . | tenths | hundredths |
| 3 | . | 1 | 8 | |
| - | 1 | . | 5 | 0 |
| . |
2. Subtract the numbers using long subtraction method
Subtract the numbers in the hundredths column from the top number:
8-0=8
| Place value | ones | . | tenths | hundredths |
| 3 | . | 1 | 8 | |
| - | 1 | . | 5 | 0 |
| . | 8 |
Because the upper digit (1) 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 (11).
| Place value | ones | . | tenths | hundredths |
| 2 | 11 | |||
| 3 | . | 1 | 8 | |
| - | 1 | . | 5 | 0 |
| . | 8 |
Subtract the numbers in the tenths column from the top number:
11-5=6
| Place value | ones | . | tenths | hundredths |
| 2 | 11 | |||
| 3 | . | 1 | 8 | |
| - | 1 | . | 5 | 0 |
| . | 6 | 8 |
Subtract the numbers in the ones column from the top number:
2-1=1
| Place value | ones | . | tenths | hundredths |
| 2 | 11 | |||
| 3 | . | 1 | 8 | |
| - | 1 | . | 5 | 0 |
| 1 | . | 6 | 8 |
The solution is: 1.68
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