Solution - Long subtraction
4.312
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | ones | . | tenths | hundredths | thousandths |
| 5 | . | 3 | 8 | ||
| - | 1 | . | 0 | 6 | 8 |
| . |
Put zeros in the blank number places:
| Place value | ones | . | tenths | hundredths | thousandths |
| 5 | . | 3 | 8 | 0 | |
| - | 1 | . | 0 | 6 | 8 |
| . |
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 | ones | . | tenths | hundredths | thousandths |
| 7 | 10 | ||||
| 5 | . | 3 | 8 | 0 | |
| - | 1 | . | 0 | 6 | 8 |
| . |
Subtract the numbers in the thousandths column from the top number:
10-0-8=2
| Place value | ones | . | tenths | hundredths | thousandths |
| 7 | 10 | ||||
| 5 | . | 3 | 8 | 0 | |
| - | 1 | . | 0 | 6 | 8 |
| . | 2 |
Subtract the numbers in the hundredths column from the top number:
7-6=1
| Place value | ones | . | tenths | hundredths | thousandths |
| 7 | 10 | ||||
| 5 | . | 3 | 8 | 0 | |
| - | 1 | . | 0 | 6 | 8 |
| . | 1 | 2 |
Subtract the numbers in the tenths column from the top number:
3-0=3
| Place value | ones | . | tenths | hundredths | thousandths |
| 7 | 10 | ||||
| 5 | . | 3 | 8 | 0 | |
| - | 1 | . | 0 | 6 | 8 |
| . | 3 | 1 | 2 |
Subtract the numbers in the ones column from the top number:
5-1=4
| Place value | ones | . | tenths | hundredths | thousandths |
| 7 | 10 | ||||
| 5 | . | 3 | 8 | 0 | |
| - | 1 | . | 0 | 6 | 8 |
| 4 | . | 3 | 1 | 2 |
The solution is: 4.312
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