Solution - Long subtraction
61.185
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 7 | 1 | . | 0 | 0 | 6 | |
| - | 9 | . | 8 | 2 | 1 | |
| . |
2. Subtract the numbers using long subtraction method
Subtract the numbers in the thousandths column from the top number:
6-1=5
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 7 | 1 | . | 0 | 0 | 6 | |
| - | 9 | . | 8 | 2 | 1 | |
| . | 5 |
Because the upper digit (0) in the hundredths column is too small to get a positive difference, borrow 1 from the number to the left (1.0) which becomes (0.9) and get (10).
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 0 | 9 | 10 | ||||
| 7 | 1 | . | 0 | 0 | 6 | |
| - | 9 | . | 8 | 2 | 1 | |
| . | 5 |
Subtract the numbers in the hundredths column from the top number:
10-2=8
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 0 | 9 | 10 | ||||
| 7 | 1 | . | 0 | 0 | 6 | |
| - | 9 | . | 8 | 2 | 1 | |
| . | 8 | 5 |
Subtract the numbers in the tenths column from the top number:
9-8=1
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 0 | 9 | 10 | ||||
| 7 | 1 | . | 0 | 0 | 6 | |
| - | 9 | . | 8 | 2 | 1 | |
| . | 1 | 8 | 5 |
Because the upper digit (0) in the ones column is too small to get a positive difference, borrow 1 from the digit (7) in the next number place which becomes (6) and get (10).
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 6 | 10 | |||||
| 0 | 9 | 10 | ||||
| 7 | 1 | . | 0 | 0 | 6 | |
| - | 9 | . | 8 | 2 | 1 | |
| . | 1 | 8 | 5 |
Subtract the numbers in the ones column from the top number:
10-9=1
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 6 | 10 | |||||
| 0 | 9 | 10 | ||||
| 7 | 1 | . | 0 | 0 | 6 | |
| - | 9 | . | 8 | 2 | 1 | |
| 1 | . | 1 | 8 | 5 |
Write 6 in the tens place.
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 6 | 10 | |||||
| 0 | 9 | 10 | ||||
| 7 | 1 | . | 0 | 0 | 6 | |
| - | 9 | . | 8 | 2 | 1 | |
| 6 | 1 | . | 1 | 8 | 5 |
The solution is: 61.185
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