Solution - Long subtraction
Other Ways to Solve:
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | thousands | hundreds | tens | ones | . | tenths |
| 1 | 8 | 1 | 7 | |||
| - | 1 | 7 | . | 2 | ||
| . |
Put zeros in the blank number places:
| Place value | thousands | hundreds | tens | ones | . | tenths |
| 1 | 8 | 1 | 7 | . | 0 | |
| - | 1 | 7 | . | 2 | ||
| . |
2. Subtract the numbers using long subtraction method
Because the upper digit (0) in the tenths column is too small to get a positive difference, borrow 1 from the digit (7) in the next number place which becomes (6) and get (10).
| Place value | thousands | hundreds | tens | ones | . | tenths |
| 6 | 10 | |||||
| 1 | 8 | 1 | 7 | . | 0 | |
| - | 1 | 7 | . | 2 | ||
| . |
Subtract the numbers in the tenths column from the top number:
10-0-2=8
| Place value | thousands | hundreds | tens | ones | . | tenths |
| 6 | 10 | |||||
| 1 | 8 | 1 | 7 | . | 0 | |
| - | 1 | 7 | . | 2 | ||
| . | 8 |
Because the upper digit (6) in the ones column is too small to get a positive difference, borrow 1 from the digit (1) in the next number place which becomes (0) and get (16).
| Place value | thousands | hundreds | tens | ones | . | tenths |
| 0 | 16 | |||||
| 6 | 10 | |||||
| 1 | 8 | 1 | 7 | . | 0 | |
| - | 1 | 7 | . | 2 | ||
| . | 8 |
Subtract the numbers in the ones column from the top number:
16-7=9
| Place value | thousands | hundreds | tens | ones | . | tenths |
| 0 | 16 | |||||
| 6 | 10 | |||||
| 1 | 8 | 1 | 7 | . | 0 | |
| - | 1 | 7 | . | 2 | ||
| 9 | . | 8 |
Because the upper digit (0) in the tens 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 | thousands | hundreds | tens | ones | . | tenths |
| 7 | 10 | |||||
| 0 | 16 | |||||
| 6 | 10 | |||||
| 1 | 8 | 1 | 7 | . | 0 | |
| - | 1 | 7 | . | 2 | ||
| 9 | . | 8 |
Subtract the numbers in the tens column from the top number:
10-1=9
| Place value | thousands | hundreds | tens | ones | . | tenths |
| 7 | 10 | |||||
| 0 | 16 | |||||
| 6 | 10 | |||||
| 1 | 8 | 1 | 7 | . | 0 | |
| - | 1 | 7 | . | 2 | ||
| 9 | 9 | . | 8 |
Write 7 in the hundreds place.
| Place value | thousands | hundreds | tens | ones | . | tenths |
| 7 | 10 | |||||
| 0 | 16 | |||||
| 6 | 10 | |||||
| 1 | 8 | 1 | 7 | . | 0 | |
| - | 1 | 7 | . | 2 | ||
| 7 | 9 | 9 | . | 8 |
Write 1 in the thousands place.
| Place value | thousands | hundreds | tens | ones | . | tenths |
| 7 | 10 | |||||
| 0 | 16 | |||||
| 6 | 10 | |||||
| 1 | 8 | 1 | 7 | . | 0 | |
| - | 1 | 7 | . | 2 | ||
| 1 | 7 | 9 | 9 | . | 8 |
The solution is: 1799.8
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