Solution - Long subtraction
7.82
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones | . | tenths | hundredths |
| 2 | 3 | . | 6 | 6 | |
| - | 1 | 5 | . | 8 | 4 |
| . |
2. Subtract the numbers using long subtraction method
Subtract the numbers in the hundredths column from the top number:
6-4=2
| Place value | tens | ones | . | tenths | hundredths |
| 2 | 3 | . | 6 | 6 | |
| - | 1 | 5 | . | 8 | 4 |
| . | 2 |
Because the upper digit (6) 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 (16).
| Place value | tens | ones | . | tenths | hundredths |
| 2 | 16 | ||||
| 2 | 3 | . | 6 | 6 | |
| - | 1 | 5 | . | 8 | 4 |
| . | 2 |
Subtract the numbers in the tenths column from the top number:
16-8=8
| Place value | tens | ones | . | tenths | hundredths |
| 2 | 16 | ||||
| 2 | 3 | . | 6 | 6 | |
| - | 1 | 5 | . | 8 | 4 |
| . | 8 | 2 |
Because the upper digit (2) in the ones 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 (12).
| Place value | tens | ones | . | tenths | hundredths |
| 1 | 12 | ||||
| 2 | 16 | ||||
| 2 | 3 | . | 6 | 6 | |
| - | 1 | 5 | . | 8 | 4 |
| . | 8 | 2 |
Subtract the numbers in the ones column from the top number:
12-5=7
| Place value | tens | ones | . | tenths | hundredths |
| 1 | 12 | ||||
| 2 | 16 | ||||
| 2 | 3 | . | 6 | 6 | |
| - | 1 | 5 | . | 8 | 4 |
| 7 | . | 8 | 2 |
Subtract the numbers in the tens column from the top number:
1-1=0
| Place value | tens | ones | . | tenths | hundredths |
| 1 | 12 | ||||
| 2 | 16 | ||||
| 2 | 3 | . | 6 | 6 | |
| - | 1 | 5 | . | 8 | 4 |
| 0 | 7 | . | 8 | 2 |
The solution is: 7.82
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