Solution - Long subtraction
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 | 0 | . | 6 | 8 | ||
| - | 3 | 9 | . | 8 | 7 | 5 |
| . |
Put zeros in the blank number places:
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 7 | 0 | . | 6 | 8 | 0 | |
| - | 3 | 9 | . | 8 | 7 | 5 |
| . |
2. Subtract the numbers using long subtraction method
Because the upper digit (0) in the thousandths 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 (10).
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 7 | 10 | |||||
| 7 | 0 | . | 6 | 8 | 0 | |
| - | 3 | 9 | . | 8 | 7 | 5 |
| . |
Subtract the numbers in the thousandths column from the top number:
10-0-5=5
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 7 | 10 | |||||
| 7 | 0 | . | 6 | 8 | 0 | |
| - | 3 | 9 | . | 8 | 7 | 5 |
| . | 5 |
Subtract the numbers in the hundredths column from the top number:
7-7=0
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 7 | 10 | |||||
| 7 | 0 | . | 6 | 8 | 0 | |
| - | 3 | 9 | . | 8 | 7 | 5 |
| . | 0 | 5 |
Because the upper digit (6) in the tenths column is too small to get a positive difference, borrow 1 from the number to the left (70) which becomes (69) and get (16).
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 6 | 16 | |||||
| 7 | 10 | |||||
| 7 | 0 | . | 6 | 8 | 0 | |
| - | 3 | 9 | . | 8 | 7 | 5 |
| . | 0 | 5 |
Subtract the numbers in the tenths column from the top number:
16-8=8
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 6 | 16 | |||||
| 7 | 10 | |||||
| 7 | 0 | . | 6 | 8 | 0 | |
| - | 3 | 9 | . | 8 | 7 | 5 |
| . | 8 | 0 | 5 |
Subtract the numbers in the ones column from the top number:
9-9=0
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 6 | 16 | |||||
| 7 | 10 | |||||
| 7 | 0 | . | 6 | 8 | 0 | |
| - | 3 | 9 | . | 8 | 7 | 5 |
| 0 | . | 8 | 0 | 5 |
Subtract the numbers in the tens column from the top number:
6-3=3
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 6 | 16 | |||||
| 7 | 10 | |||||
| 7 | 0 | . | 6 | 8 | 0 | |
| - | 3 | 9 | . | 8 | 7 | 5 |
| 3 | 0 | . | 8 | 0 | 5 |
The solution is: 30.805
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