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 |
| 8 | 8 | 4 | . | 2 | 2 | 7 | |
| - | 7 | 9 | 3 | . | 0 | 1 | 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 digit (2) in the next number place which becomes (1) and get (17).
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 1 | 17 | ||||||
| 8 | 8 | 4 | . | 2 | 2 | 7 | |
| - | 7 | 9 | 3 | . | 0 | 1 | 9 |
| . |
Subtract the numbers in the thousandths column from the top number:
17-9=8
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 1 | 17 | ||||||
| 8 | 8 | 4 | . | 2 | 2 | 7 | |
| - | 7 | 9 | 3 | . | 0 | 1 | 9 |
| . | 8 |
Subtract the numbers in the hundredths column from the top number:
1-1=0
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 1 | 17 | ||||||
| 8 | 8 | 4 | . | 2 | 2 | 7 | |
| - | 7 | 9 | 3 | . | 0 | 1 | 9 |
| . | 0 | 8 |
Subtract the numbers in the tenths column from the top number:
2-0=2
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 1 | 17 | ||||||
| 8 | 8 | 4 | . | 2 | 2 | 7 | |
| - | 7 | 9 | 3 | . | 0 | 1 | 9 |
| . | 2 | 0 | 8 |
Subtract the numbers in the ones column from the top number:
4-3=1
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 1 | 17 | ||||||
| 8 | 8 | 4 | . | 2 | 2 | 7 | |
| - | 7 | 9 | 3 | . | 0 | 1 | 9 |
| 1 | . | 2 | 0 | 8 |
Because the upper digit (8) in the tens 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 (18).
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 7 | 18 | ||||||
| 1 | 17 | ||||||
| 8 | 8 | 4 | . | 2 | 2 | 7 | |
| - | 7 | 9 | 3 | . | 0 | 1 | 9 |
| 1 | . | 2 | 0 | 8 |
Subtract the numbers in the tens column from the top number:
18-9=9
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 7 | 18 | ||||||
| 1 | 17 | ||||||
| 8 | 8 | 4 | . | 2 | 2 | 7 | |
| - | 7 | 9 | 3 | . | 0 | 1 | 9 |
| 9 | 1 | . | 2 | 0 | 8 |
Subtract the numbers in the hundreds column from the top number:
7-7=0
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 7 | 18 | ||||||
| 1 | 17 | ||||||
| 8 | 8 | 4 | . | 2 | 2 | 7 | |
| - | 7 | 9 | 3 | . | 0 | 1 | 9 |
| 0 | 9 | 1 | . | 2 | 0 | 8 |
The solution is: 91.208
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