Solution - Long subtraction
40.61
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
Place value | tens | ones | . | tenths | hundredths |
4 | 8 | . | 5 | 1 | |
- | 7 | . | 9 | ||
. |
Put zeros in the blank number places:
Place value | tens | ones | . | tenths | hundredths |
4 | 8 | . | 5 | 1 | |
- | 7 | . | 9 | 0 | |
. |
2. Subtract the numbers using long subtraction method
Subtract the numbers in the hundredths column from the top number:
1-0=1
Place value | tens | ones | . | tenths | hundredths |
4 | 8 | . | 5 | 1 | |
- | 7 | . | 9 | 0 | |
. | 1 |
Because the upper digit (5) in the tenths column is too small to get a positive difference, borrow 1 from the digit (8) in the next number place which becomes (7) and get (15).
Place value | tens | ones | . | tenths | hundredths |
7 | 15 | ||||
4 | 8 | . | 5 | 1 | |
- | 7 | . | 9 | 0 | |
. | 1 |
Subtract the numbers in the tenths column from the top number:
15-9=6
Place value | tens | ones | . | tenths | hundredths |
7 | 15 | ||||
4 | 8 | . | 5 | 1 | |
- | 7 | . | 9 | 0 | |
. | 6 | 1 |
Subtract the numbers in the ones column from the top number:
7-7=0
Place value | tens | ones | . | tenths | hundredths |
7 | 15 | ||||
4 | 8 | . | 5 | 1 | |
- | 7 | . | 9 | 0 | |
0 | . | 6 | 1 |
Write 4 in the tens place.
Place value | tens | ones | . | tenths | hundredths |
7 | 15 | ||||
4 | 8 | . | 5 | 1 | |
- | 7 | . | 9 | 0 | |
4 | 0 | . | 6 | 1 |
The solution is: 40.61
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