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 |
| 2 | 2 | 1 | ||||
| - | 3 | 3 | . | 1 | 5 | |
| . |
Put zeros in the blank number places:
| Place value | hundreds | tens | ones | . | tenths | hundredths |
| 2 | 2 | 1 | . | 0 | 0 | |
| - | 3 | 3 | . | 1 | 5 | |
| . |
2. Subtract the numbers using long subtraction method
Because the upper digit (0) in the hundredths column is too small to get a positive difference, borrow 1 from the number to the left (1.0) which becomes (0.9) and get (10).
| Place value | hundreds | tens | ones | . | tenths | hundredths |
| 0 | 9 | 10 | ||||
| 2 | 2 | 1 | . | 0 | 0 | |
| - | 3 | 3 | . | 1 | 5 | |
| . |
Subtract the numbers in the hundredths column from the top number:
10-0-5=5
| Place value | hundreds | tens | ones | . | tenths | hundredths |
| 0 | 9 | 10 | ||||
| 2 | 2 | 1 | . | 0 | 0 | |
| - | 3 | 3 | . | 1 | 5 | |
| . | 5 |
Subtract the numbers in the tenths column from the top number:
9-1=8
| Place value | hundreds | tens | ones | . | tenths | hundredths |
| 0 | 9 | 10 | ||||
| 2 | 2 | 1 | . | 0 | 0 | |
| - | 3 | 3 | . | 1 | 5 | |
| . | 8 | 5 |
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 | hundreds | tens | ones | . | tenths | hundredths |
| 1 | 10 | |||||
| 0 | 9 | 10 | ||||
| 2 | 2 | 1 | . | 0 | 0 | |
| - | 3 | 3 | . | 1 | 5 | |
| . | 8 | 5 |
Subtract the numbers in the ones column from the top number:
10-3=7
| Place value | hundreds | tens | ones | . | tenths | hundredths |
| 1 | 10 | |||||
| 0 | 9 | 10 | ||||
| 2 | 2 | 1 | . | 0 | 0 | |
| - | 3 | 3 | . | 1 | 5 | |
| 7 | . | 8 | 5 |
Because the upper digit (1) in the tens 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 | hundreds | tens | ones | . | tenths | hundredths |
| 1 | 11 | |||||
| 1 | 10 | |||||
| 0 | 9 | 10 | ||||
| 2 | 2 | 1 | . | 0 | 0 | |
| - | 3 | 3 | . | 1 | 5 | |
| 7 | . | 8 | 5 |
Subtract the numbers in the tens column from the top number:
11-3=8
| Place value | hundreds | tens | ones | . | tenths | hundredths |
| 1 | 11 | |||||
| 1 | 10 | |||||
| 0 | 9 | 10 | ||||
| 2 | 2 | 1 | . | 0 | 0 | |
| - | 3 | 3 | . | 1 | 5 | |
| 8 | 7 | . | 8 | 5 |
Write 1 in the hundreds place.
| Place value | hundreds | tens | ones | . | tenths | hundredths |
| 1 | 11 | |||||
| 1 | 10 | |||||
| 0 | 9 | 10 | ||||
| 2 | 2 | 1 | . | 0 | 0 | |
| - | 3 | 3 | . | 1 | 5 | |
| 1 | 8 | 7 | . | 8 | 5 |
The solution is: 187.85
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