Solution - Long subtraction
3.52
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones | . | tenths | hundredths |
| 7 | 9 | . | 2 | 1 | |
| - | 7 | 5 | . | 6 | 9 |
| . |
2. Subtract the numbers using long subtraction method
Because the upper digit (1) 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 (11).
| Place value | tens | ones | . | tenths | hundredths |
| 1 | 11 | ||||
| 7 | 9 | . | 2 | 1 | |
| - | 7 | 5 | . | 6 | 9 |
| . |
Subtract the numbers in the hundredths column from the top number:
11-9=2
| Place value | tens | ones | . | tenths | hundredths |
| 1 | 11 | ||||
| 7 | 9 | . | 2 | 1 | |
| - | 7 | 5 | . | 6 | 9 |
| . | 2 |
Because the upper digit (1) in the tenths column is too small to get a positive difference, borrow 1 from the digit (9) in the next number place which becomes (8) and get (11).
| Place value | tens | ones | . | tenths | hundredths |
| 8 | 11 | ||||
| 1 | 11 | ||||
| 7 | 9 | . | 2 | 1 | |
| - | 7 | 5 | . | 6 | 9 |
| . | 2 |
Subtract the numbers in the tenths column from the top number:
11-6=5
| Place value | tens | ones | . | tenths | hundredths |
| 8 | 11 | ||||
| 1 | 11 | ||||
| 7 | 9 | . | 2 | 1 | |
| - | 7 | 5 | . | 6 | 9 |
| . | 5 | 2 |
Subtract the numbers in the ones column from the top number:
8-5=3
| Place value | tens | ones | . | tenths | hundredths |
| 8 | 11 | ||||
| 1 | 11 | ||||
| 7 | 9 | . | 2 | 1 | |
| - | 7 | 5 | . | 6 | 9 |
| 3 | . | 5 | 2 |
Subtract the numbers in the tens column from the top number:
7-7=0
| Place value | tens | ones | . | tenths | hundredths |
| 8 | 11 | ||||
| 1 | 11 | ||||
| 7 | 9 | . | 2 | 1 | |
| - | 7 | 5 | . | 6 | 9 |
| 0 | 3 | . | 5 | 2 |
The solution is: 3.52
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