Solution - Long subtraction
28.5
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones | . | tenths |
| 3 | 0 | |||
| - | 1 | . | 5 | |
| . |
Put zeros in the blank number places:
| Place value | tens | ones | . | tenths |
| 3 | 0 | . | 0 | |
| - | 1 | . | 5 | |
| . |
2. Subtract the numbers using long subtraction method
Because the upper digit (0) in the tenths column is too small to get a positive difference, borrow 1 from the number to the left (30) which becomes (29) and get (10).
| Place value | tens | ones | . | tenths |
| 2 | 10 | |||
| 3 | 0 | . | 0 | |
| - | 1 | . | 5 | |
| . |
Subtract the numbers in the tenths column from the top number:
10-0-5=5
| Place value | tens | ones | . | tenths |
| 2 | 10 | |||
| 3 | 0 | . | 0 | |
| - | 1 | . | 5 | |
| . | 5 |
Subtract the numbers in the ones column from the top number:
9-1=8
| Place value | tens | ones | . | tenths |
| 2 | 10 | |||
| 3 | 0 | . | 0 | |
| - | 1 | . | 5 | |
| 8 | . | 5 |
Write 2 in the tens place.
| Place value | tens | ones | . | tenths |
| 2 | 10 | |||
| 3 | 0 | . | 0 | |
| - | 1 | . | 5 | |
| 2 | 8 | . | 5 |
The solution is: 28.5
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