Solution - Long subtraction
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 2 | 0 | 6 | . | 4 | |||
| - | 1 | 7 | 8 | . | 9 | 5 | 6 |
| . |
Put zeros in the blank number places:
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 2 | 0 | 6 | . | 4 | 0 | 0 | |
| - | 1 | 7 | 8 | . | 9 | 5 | 6 |
| . |
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 (40) which becomes (39) and get (10).
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 3 | 9 | 10 | |||||
| 2 | 0 | 6 | . | 4 | 0 | 0 | |
| - | 1 | 7 | 8 | . | 9 | 5 | 6 |
| . |
Subtract the numbers in the thousandths column from the top number:
10-0-6=4
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 3 | 9 | 10 | |||||
| 2 | 0 | 6 | . | 4 | 0 | 0 | |
| - | 1 | 7 | 8 | . | 9 | 5 | 6 |
| . | 4 |
Subtract the numbers in the hundredths column from the top number:
9-5=4
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 3 | 9 | 10 | |||||
| 2 | 0 | 6 | . | 4 | 0 | 0 | |
| - | 1 | 7 | 8 | . | 9 | 5 | 6 |
| . | 4 | 4 |
Because the upper digit (3) in the tenths column is too small to get a positive difference, borrow 1 from the digit (6) in the next number place which becomes (5) and get (13).
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 5 | 13 | ||||||
| 3 | 9 | 10 | |||||
| 2 | 0 | 6 | . | 4 | 0 | 0 | |
| - | 1 | 7 | 8 | . | 9 | 5 | 6 |
| . | 4 | 4 |
Subtract the numbers in the tenths column from the top number:
13-9=4
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 5 | 13 | ||||||
| 3 | 9 | 10 | |||||
| 2 | 0 | 6 | . | 4 | 0 | 0 | |
| - | 1 | 7 | 8 | . | 9 | 5 | 6 |
| . | 4 | 4 | 4 |
Because the upper digit (5) in the ones column is too small to get a positive difference, borrow 1 from the number to the left (20) which becomes (19) and get (15).
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 1 | 9 | 15 | |||||
| 5 | 13 | ||||||
| 3 | 9 | 10 | |||||
| 2 | 0 | 6 | . | 4 | 0 | 0 | |
| - | 1 | 7 | 8 | . | 9 | 5 | 6 |
| . | 4 | 4 | 4 |
Subtract the numbers in the ones column from the top number:
15-8=7
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 1 | 9 | 15 | |||||
| 5 | 13 | ||||||
| 3 | 9 | 10 | |||||
| 2 | 0 | 6 | . | 4 | 0 | 0 | |
| - | 1 | 7 | 8 | . | 9 | 5 | 6 |
| 7 | . | 4 | 4 | 4 |
Subtract the numbers in the tens column from the top number:
9-7=2
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 1 | 9 | 15 | |||||
| 5 | 13 | ||||||
| 3 | 9 | 10 | |||||
| 2 | 0 | 6 | . | 4 | 0 | 0 | |
| - | 1 | 7 | 8 | . | 9 | 5 | 6 |
| 2 | 7 | . | 4 | 4 | 4 |
Subtract the numbers in the hundreds column from the top number:
1-1=0
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 1 | 9 | 15 | |||||
| 5 | 13 | ||||||
| 3 | 9 | 10 | |||||
| 2 | 0 | 6 | . | 4 | 0 | 0 | |
| - | 1 | 7 | 8 | . | 9 | 5 | 6 |
| 0 | 2 | 7 | . | 4 | 4 | 4 |
The solution is: 27.444
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