Solution - Long subtraction
312.851
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 |
| 3 | 8 | 9 | . | 0 | 0 | 2 | |
| - | 7 | 6 | . | 1 | 5 | 1 | |
| . |
2. Subtract the numbers using long subtraction method
Subtract the numbers in the thousandths column from the top number:
2-1=1
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 3 | 8 | 9 | . | 0 | 0 | 2 | |
| - | 7 | 6 | . | 1 | 5 | 1 | |
| . | 1 |
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 (9.0) which becomes (8.9) and get (10).
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 8 | 9 | 10 | |||||
| 3 | 8 | 9 | . | 0 | 0 | 2 | |
| - | 7 | 6 | . | 1 | 5 | 1 | |
| . | 1 |
Subtract the numbers in the hundredths column from the top number:
10-5=5
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 8 | 9 | 10 | |||||
| 3 | 8 | 9 | . | 0 | 0 | 2 | |
| - | 7 | 6 | . | 1 | 5 | 1 | |
| . | 5 | 1 |
Subtract the numbers in the tenths column from the top number:
9-1=8
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 8 | 9 | 10 | |||||
| 3 | 8 | 9 | . | 0 | 0 | 2 | |
| - | 7 | 6 | . | 1 | 5 | 1 | |
| . | 8 | 5 | 1 |
Subtract the numbers in the ones column from the top number:
8-6=2
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 8 | 9 | 10 | |||||
| 3 | 8 | 9 | . | 0 | 0 | 2 | |
| - | 7 | 6 | . | 1 | 5 | 1 | |
| 2 | . | 8 | 5 | 1 |
Subtract the numbers in the tens column from the top number:
8-7=1
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 8 | 9 | 10 | |||||
| 3 | 8 | 9 | . | 0 | 0 | 2 | |
| - | 7 | 6 | . | 1 | 5 | 1 | |
| 1 | 2 | . | 8 | 5 | 1 |
Write 3 in the hundreds place.
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 8 | 9 | 10 | |||||
| 3 | 8 | 9 | . | 0 | 0 | 2 | |
| - | 7 | 6 | . | 1 | 5 | 1 | |
| 3 | 1 | 2 | . | 8 | 5 | 1 |
The solution is: 312.851
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