Solution - Long subtraction
19.15
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones | . | tenths | hundredths |
| 2 | 8 | . | 4 | ||
| - | 9 | . | 2 | 5 | |
| . |
Put zeros in the blank number places:
| Place value | tens | ones | . | tenths | hundredths |
| 2 | 8 | . | 4 | 0 | |
| - | 9 | . | 2 | 5 | |
| . |
2. Subtract the numbers using long subtraction method
Because the upper digit (0) in the hundredths column is too small to get a positive difference, borrow 1 from the digit (4) in the next number place which becomes (3) and get (10).
| Place value | tens | ones | . | tenths | hundredths |
| 3 | 10 | ||||
| 2 | 8 | . | 4 | 0 | |
| - | 9 | . | 2 | 5 | |
| . |
Subtract the numbers in the hundredths column from the top number:
10-0-5=5
| Place value | tens | ones | . | tenths | hundredths |
| 3 | 10 | ||||
| 2 | 8 | . | 4 | 0 | |
| - | 9 | . | 2 | 5 | |
| . | 5 |
Subtract the numbers in the tenths column from the top number:
3-2=1
| Place value | tens | ones | . | tenths | hundredths |
| 3 | 10 | ||||
| 2 | 8 | . | 4 | 0 | |
| - | 9 | . | 2 | 5 | |
| . | 1 | 5 |
Because the upper digit (8) 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 (18).
| Place value | tens | ones | . | tenths | hundredths |
| 1 | 18 | ||||
| 3 | 10 | ||||
| 2 | 8 | . | 4 | 0 | |
| - | 9 | . | 2 | 5 | |
| . | 1 | 5 |
Subtract the numbers in the ones column from the top number:
18-9=9
| Place value | tens | ones | . | tenths | hundredths |
| 1 | 18 | ||||
| 3 | 10 | ||||
| 2 | 8 | . | 4 | 0 | |
| - | 9 | . | 2 | 5 | |
| 9 | . | 1 | 5 |
Write 1 in the tens place.
| Place value | tens | ones | . | tenths | hundredths |
| 1 | 18 | ||||
| 3 | 10 | ||||
| 2 | 8 | . | 4 | 0 | |
| - | 9 | . | 2 | 5 | |
| 1 | 9 | . | 1 | 5 |
The solution is: 19.15
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