คำตอบ - Long subtraction
13.6
คำอธิบายทีละขั้นตอน
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones | . | tenths |
| 1 | 8 | . | 4 | |
| 0 | . | 8 | ||
| - | 4 | |||
| . |
Put zeros in the blank number places:
| Place value | tens | ones | . | tenths |
| 1 | 8 | . | 4 | |
| 0 | . | 8 | ||
| - | 4 | . | 0 | |
| . |
2. Subtract the numbers using long subtraction method
Because the upper digit (4) in the tenths 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 (14).
| Place value | tens | ones | . | tenths |
| 7 | 14 | |||
| 1 | 8 | . | 4 | |
| 0 | . | 8 | ||
| - | 4 | . | 0 | |
| . |
Subtract the numbers in the tenths column from the top number:
14-8-0=6
| Place value | tens | ones | . | tenths |
| 7 | 14 | |||
| 1 | 8 | . | 4 | |
| 0 | . | 8 | ||
| - | 4 | . | 0 | |
| . | 6 |
Subtract the numbers in the ones column from the top number:
7-0-4=3
| Place value | tens | ones | . | tenths |
| 7 | 14 | |||
| 1 | 8 | . | 4 | |
| 0 | . | 8 | ||
| - | 4 | . | 0 | |
| 3 | . | 6 |
Write 1 in the tens place.
| Place value | tens | ones | . | tenths |
| 7 | 14 | |||
| 1 | 8 | . | 4 | |
| 0 | . | 8 | ||
| - | 4 | . | 0 | |
| 1 | 3 | . | 6 |
The solution is: 13.6
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