คำตอบ - Long subtraction
19.296
คำอธิบายทีละขั้นตอน
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 2 | 1 | . | 3 | |||
| - | 2 | . | 0 | 0 | 4 | |
| . |
Put zeros in the blank number places:
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 2 | 1 | . | 3 | 0 | 0 | |
| - | 2 | . | 0 | 0 | 4 | |
| . |
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 number to the left (30) which becomes (29) and get (10).
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 2 | 9 | 10 | ||||
| 2 | 1 | . | 3 | 0 | 0 | |
| - | 2 | . | 0 | 0 | 4 | |
| . |
Subtract the numbers in the thousandths column from the top number:
10-0-4=6
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 2 | 9 | 10 | ||||
| 2 | 1 | . | 3 | 0 | 0 | |
| - | 2 | . | 0 | 0 | 4 | |
| . | 6 |
Subtract the numbers in the hundredths column from the top number:
9-0=9
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 2 | 9 | 10 | ||||
| 2 | 1 | . | 3 | 0 | 0 | |
| - | 2 | . | 0 | 0 | 4 | |
| . | 9 | 6 |
Subtract the numbers in the tenths column from the top number:
2-0=2
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 2 | 9 | 10 | ||||
| 2 | 1 | . | 3 | 0 | 0 | |
| - | 2 | . | 0 | 0 | 4 | |
| . | 2 | 9 | 6 |
Because the upper digit (1) in the ones 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 (11).
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 1 | 11 | |||||
| 2 | 9 | 10 | ||||
| 2 | 1 | . | 3 | 0 | 0 | |
| - | 2 | . | 0 | 0 | 4 | |
| . | 2 | 9 | 6 |
Subtract the numbers in the ones column from the top number:
11-2=9
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 1 | 11 | |||||
| 2 | 9 | 10 | ||||
| 2 | 1 | . | 3 | 0 | 0 | |
| - | 2 | . | 0 | 0 | 4 | |
| 9 | . | 2 | 9 | 6 |
Write 1 in the tens place.
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 1 | 11 | |||||
| 2 | 9 | 10 | ||||
| 2 | 1 | . | 3 | 0 | 0 | |
| - | 2 | . | 0 | 0 | 4 | |
| 1 | 9 | . | 2 | 9 | 6 |
The solution is: 19.296
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