Solution - Long subtraction
1.985
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | ones | . | tenths | hundredths | thousandths |
| 2 | . | 1 | 6 | 5 | |
| - | 0 | . | 1 | 8 | |
| . |
Put zeros in the blank number places:
| Place value | ones | . | tenths | hundredths | thousandths |
| 2 | . | 1 | 6 | 5 | |
| - | 0 | . | 1 | 8 | 0 |
| . |
2. Subtract the numbers using long subtraction method
Subtract the numbers in the thousandths column from the top number:
5-0=5
| Place value | ones | . | tenths | hundredths | thousandths |
| 2 | . | 1 | 6 | 5 | |
| - | 0 | . | 1 | 8 | 0 |
| . | 5 |
Because the upper digit (6) in the hundredths 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 | ones | . | tenths | hundredths | thousandths |
| 0 | 16 | ||||
| 2 | . | 1 | 6 | 5 | |
| - | 0 | . | 1 | 8 | 0 |
| . | 5 |
Subtract the numbers in the hundredths column from the top number:
16-8=8
| Place value | ones | . | tenths | hundredths | thousandths |
| 0 | 16 | ||||
| 2 | . | 1 | 6 | 5 | |
| - | 0 | . | 1 | 8 | 0 |
| . | 8 | 5 |
Because the upper digit (0) in the tenths 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 | ones | . | tenths | hundredths | thousandths |
| 1 | 10 | ||||
| 0 | 16 | ||||
| 2 | . | 1 | 6 | 5 | |
| - | 0 | . | 1 | 8 | 0 |
| . | 8 | 5 |
Subtract the numbers in the tenths column from the top number:
10-1=9
| Place value | ones | . | tenths | hundredths | thousandths |
| 1 | 10 | ||||
| 0 | 16 | ||||
| 2 | . | 1 | 6 | 5 | |
| - | 0 | . | 1 | 8 | 0 |
| . | 9 | 8 | 5 |
Subtract the numbers in the ones column from the top number:
1-0=1
| Place value | ones | . | tenths | hundredths | thousandths |
| 1 | 10 | ||||
| 0 | 16 | ||||
| 2 | . | 1 | 6 | 5 | |
| - | 0 | . | 1 | 8 | 0 |
| 1 | . | 9 | 8 | 5 |
The solution is: 1.985
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