Solution - Long subtraction
3.87
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones | . | tenths | hundredths |
| 1 | 0 | . | 2 | 4 | |
| - | 6 | . | 3 | 7 | |
| . |
2. Subtract the numbers using long subtraction method
Because the upper digit (4) in the hundredths column is too small to get a positive difference, borrow 1 from the digit (2) in the next number place which becomes (1) and get (14).
| Place value | tens | ones | . | tenths | hundredths |
| 1 | 14 | ||||
| 1 | 0 | . | 2 | 4 | |
| - | 6 | . | 3 | 7 | |
| . |
Subtract the numbers in the hundredths column from the top number:
14-7=7
| Place value | tens | ones | . | tenths | hundredths |
| 1 | 14 | ||||
| 1 | 0 | . | 2 | 4 | |
| - | 6 | . | 3 | 7 | |
| . | 7 |
Because the upper digit (1) in the tenths column is too small to get a positive difference, borrow 1 from the number to the left (10) which becomes (09) and get (11).
| Place value | tens | ones | . | tenths | hundredths |
| 0 | 11 | ||||
| 1 | 14 | ||||
| 1 | 0 | . | 2 | 4 | |
| - | 6 | . | 3 | 7 | |
| . | 7 |
Subtract the numbers in the tenths column from the top number:
11-3=8
| Place value | tens | ones | . | tenths | hundredths |
| 0 | 11 | ||||
| 1 | 14 | ||||
| 1 | 0 | . | 2 | 4 | |
| - | 6 | . | 3 | 7 | |
| . | 8 | 7 |
Subtract the numbers in the ones column from the top number:
9-6=3
| Place value | tens | ones | . | tenths | hundredths |
| 0 | 11 | ||||
| 1 | 14 | ||||
| 1 | 0 | . | 2 | 4 | |
| - | 6 | . | 3 | 7 | |
| 3 | . | 8 | 7 |
Write 0 in the tens place.
| Place value | tens | ones | . | tenths | hundredths |
| 0 | 11 | ||||
| 1 | 14 | ||||
| 1 | 0 | . | 2 | 4 | |
| - | 6 | . | 3 | 7 | |
| 0 | 3 | . | 8 | 7 |
The solution is: 3.87
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