Solution - Long subtraction
17.697
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 2 | 1 | |||||
| - | 3 | . | 3 | 0 | 3 | |
| . |
Put zeros in the blank number places:
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 2 | 1 | . | 0 | 0 | 0 | |
| - | 3 | . | 3 | 0 | 3 | |
| . |
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 (1.00) which becomes (0.99) and get (10).
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 0 | 9 | 9 | 10 | |||
| 2 | 1 | . | 0 | 0 | 0 | |
| - | 3 | . | 3 | 0 | 3 | |
| . |
Subtract the numbers in the thousandths column from the top number:
10-0-3=7
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 0 | 9 | 9 | 10 | |||
| 2 | 1 | . | 0 | 0 | 0 | |
| - | 3 | . | 3 | 0 | 3 | |
| . | 7 |
Subtract the numbers in the hundredths column from the top number:
9-0=9
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 0 | 9 | 9 | 10 | |||
| 2 | 1 | . | 0 | 0 | 0 | |
| - | 3 | . | 3 | 0 | 3 | |
| . | 9 | 7 |
Subtract the numbers in the tenths column from the top number:
9-3=6
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 0 | 9 | 9 | 10 | |||
| 2 | 1 | . | 0 | 0 | 0 | |
| - | 3 | . | 3 | 0 | 3 | |
| . | 6 | 9 | 7 |
Because the upper digit (0) 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 (10).
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 1 | 10 | |||||
| 0 | 9 | 9 | 10 | |||
| 2 | 1 | . | 0 | 0 | 0 | |
| - | 3 | . | 3 | 0 | 3 | |
| . | 6 | 9 | 7 |
Subtract the numbers in the ones column from the top number:
10-3=7
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 1 | 10 | |||||
| 0 | 9 | 9 | 10 | |||
| 2 | 1 | . | 0 | 0 | 0 | |
| - | 3 | . | 3 | 0 | 3 | |
| 7 | . | 6 | 9 | 7 |
Write 1 in the tens place.
| Place value | tens | ones | . | tenths | hundredths | thousandths |
| 1 | 10 | |||||
| 0 | 9 | 9 | 10 | |||
| 2 | 1 | . | 0 | 0 | 0 | |
| - | 3 | . | 3 | 0 | 3 | |
| 1 | 7 | . | 6 | 9 | 7 |
The solution is: 17.697
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