Solution - Long subtraction
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 9 | 0 | 7 | . | 9 | 0 | 7 | |
| - | 7 | 0 | 9 | . | 7 | 0 | 9 |
| . |
2. Subtract the numbers using long subtraction method
Because the upper digit (7) in the thousandths column is too small to get a positive difference, borrow 1 from the number to the left (90) which becomes (89) and get (17).
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 8 | 9 | 17 | |||||
| 9 | 0 | 7 | . | 9 | 0 | 7 | |
| - | 7 | 0 | 9 | . | 7 | 0 | 9 |
| . |
Subtract the numbers in the thousandths column from the top number:
17-9=8
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 8 | 9 | 17 | |||||
| 9 | 0 | 7 | . | 9 | 0 | 7 | |
| - | 7 | 0 | 9 | . | 7 | 0 | 9 |
| . | 8 |
Subtract the numbers in the hundredths column from the top number:
9-0=9
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 8 | 9 | 17 | |||||
| 9 | 0 | 7 | . | 9 | 0 | 7 | |
| - | 7 | 0 | 9 | . | 7 | 0 | 9 |
| . | 9 | 8 |
Subtract the numbers in the tenths column from the top number:
8-7=1
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 8 | 9 | 17 | |||||
| 9 | 0 | 7 | . | 9 | 0 | 7 | |
| - | 7 | 0 | 9 | . | 7 | 0 | 9 |
| . | 1 | 9 | 8 |
Because the upper digit (7) in the ones column is too small to get a positive difference, borrow 1 from the number to the left (90) which becomes (89) and get (17).
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 8 | 9 | 17 | |||||
| 8 | 9 | 17 | |||||
| 9 | 0 | 7 | . | 9 | 0 | 7 | |
| - | 7 | 0 | 9 | . | 7 | 0 | 9 |
| . | 1 | 9 | 8 |
Subtract the numbers in the ones column from the top number:
17-9=8
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 8 | 9 | 17 | |||||
| 8 | 9 | 17 | |||||
| 9 | 0 | 7 | . | 9 | 0 | 7 | |
| - | 7 | 0 | 9 | . | 7 | 0 | 9 |
| 8 | . | 1 | 9 | 8 |
Subtract the numbers in the tens column from the top number:
9-0=9
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 8 | 9 | 17 | |||||
| 8 | 9 | 17 | |||||
| 9 | 0 | 7 | . | 9 | 0 | 7 | |
| - | 7 | 0 | 9 | . | 7 | 0 | 9 |
| 9 | 8 | . | 1 | 9 | 8 |
Subtract the numbers in the hundreds column from the top number:
8-7=1
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 8 | 9 | 17 | |||||
| 8 | 9 | 17 | |||||
| 9 | 0 | 7 | . | 9 | 0 | 7 | |
| - | 7 | 0 | 9 | . | 7 | 0 | 9 |
| 1 | 9 | 8 | . | 1 | 9 | 8 |
The solution is: 198.198
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