Solution - Long subtraction
15.43
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 | 3 | |
| - | 2 | . | 7 | ||
| . |
Put zeros in the blank number places:
| Place value | tens | ones | . | tenths | hundredths |
| 1 | 8 | . | 1 | 3 | |
| - | 2 | . | 7 | 0 | |
| . |
2. Subtract the numbers using long subtraction method
Subtract the numbers in the hundredths column from the top number:
3-0=3
| Place value | tens | ones | . | tenths | hundredths |
| 1 | 8 | . | 1 | 3 | |
| - | 2 | . | 7 | 0 | |
| . | 3 |
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 | 3 | |
| - | 2 | . | 7 | 0 | |
| . | 3 |
Subtract the numbers in the tenths column from the top number:
11-7=4
| Place value | tens | ones | . | tenths | hundredths |
| 7 | 11 | ||||
| 1 | 8 | . | 1 | 3 | |
| - | 2 | . | 7 | 0 | |
| . | 4 | 3 |
Subtract the numbers in the ones column from the top number:
7-2=5
| Place value | tens | ones | . | tenths | hundredths |
| 7 | 11 | ||||
| 1 | 8 | . | 1 | 3 | |
| - | 2 | . | 7 | 0 | |
| 5 | . | 4 | 3 |
Write 1 in the tens place.
| Place value | tens | ones | . | tenths | hundredths |
| 7 | 11 | ||||
| 1 | 8 | . | 1 | 3 | |
| - | 2 | . | 7 | 0 | |
| 1 | 5 | . | 4 | 3 |
The solution is: 15.43
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