Solution - Long subtraction
8.9
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
Place value | tens | ones | . | tenths |
1 | 2 | . | 5 | |
0 | . | 7 | ||
- | 2 | . | 9 | |
. |
2. Subtract the numbers using long subtraction method
Because the upper digit (5) in the tenths column is too small to get a positive difference, borrow 2 from the digit (2) in the next number place which becomes (0) and get (25).
Place value | tens | ones | . | tenths |
0 | 25 | |||
1 | 2 | . | 5 | |
0 | . | 7 | ||
- | 2 | . | 9 | |
. |
Subtract the numbers in the tenths column from the top number:
25-7-9=9
Place value | tens | ones | . | tenths |
0 | 25 | |||
1 | 2 | . | 5 | |
0 | . | 7 | ||
- | 2 | . | 9 | |
. | 9 |
Because the upper digit (0) in the ones column is too small to get a positive difference, borrow 1 from the digit (1) in the next number place which becomes (0) and get (10).
Place value | tens | ones | . | tenths |
0 | 10 | |||
0 | 25 | |||
1 | 2 | . | 5 | |
0 | . | 7 | ||
- | 2 | . | 9 | |
. | 9 |
Subtract the numbers in the ones column from the top number:
10-0-2=8
Place value | tens | ones | . | tenths |
0 | 10 | |||
0 | 25 | |||
1 | 2 | . | 5 | |
0 | . | 7 | ||
- | 2 | . | 9 | |
8 | . | 9 |
Write 0 in the tens place.
Place value | tens | ones | . | tenths |
0 | 10 | |||
0 | 25 | |||
1 | 2 | . | 5 | |
0 | . | 7 | ||
- | 2 | . | 9 | |
0 | 8 | . | 9 |
The solution is: 8.9
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