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 |
| 1 | 2 | 4 | . | 8 | 3 | ||
| - | 1 | 8 | . | 9 | 6 | 5 | |
| . |
Put zeros in the blank number places:
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 1 | 2 | 4 | . | 8 | 3 | 0 | |
| - | 1 | 8 | . | 9 | 6 | 5 | |
| . |
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 digit (3) in the next number place which becomes (2) and get (10).
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 2 | 10 | ||||||
| 1 | 2 | 4 | . | 8 | 3 | 0 | |
| - | 1 | 8 | . | 9 | 6 | 5 | |
| . |
Subtract the numbers in the thousandths column from the top number:
10-0-5=5
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 2 | 10 | ||||||
| 1 | 2 | 4 | . | 8 | 3 | 0 | |
| - | 1 | 8 | . | 9 | 6 | 5 | |
| . | 5 |
Because the upper digit (2) in the hundredths 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 (12).
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 7 | 12 | ||||||
| 2 | 10 | ||||||
| 1 | 2 | 4 | . | 8 | 3 | 0 | |
| - | 1 | 8 | . | 9 | 6 | 5 | |
| . | 5 |
Subtract the numbers in the hundredths column from the top number:
12-6=6
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 7 | 12 | ||||||
| 2 | 10 | ||||||
| 1 | 2 | 4 | . | 8 | 3 | 0 | |
| - | 1 | 8 | . | 9 | 6 | 5 | |
| . | 6 | 5 |
Because the upper digit (7) in the tenths column is too small to get a positive difference, borrow 1 from the digit (4) in the next number place which becomes (3) and get (17).
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 3 | 17 | ||||||
| 7 | 12 | ||||||
| 2 | 10 | ||||||
| 1 | 2 | 4 | . | 8 | 3 | 0 | |
| - | 1 | 8 | . | 9 | 6 | 5 | |
| . | 6 | 5 |
Subtract the numbers in the tenths column from the top number:
17-9=8
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 3 | 17 | ||||||
| 7 | 12 | ||||||
| 2 | 10 | ||||||
| 1 | 2 | 4 | . | 8 | 3 | 0 | |
| - | 1 | 8 | . | 9 | 6 | 5 | |
| . | 8 | 6 | 5 |
Because the upper digit (3) 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 (13).
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 1 | 13 | ||||||
| 3 | 17 | ||||||
| 7 | 12 | ||||||
| 2 | 10 | ||||||
| 1 | 2 | 4 | . | 8 | 3 | 0 | |
| - | 1 | 8 | . | 9 | 6 | 5 | |
| . | 8 | 6 | 5 |
Subtract the numbers in the ones column from the top number:
13-8=5
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 1 | 13 | ||||||
| 3 | 17 | ||||||
| 7 | 12 | ||||||
| 2 | 10 | ||||||
| 1 | 2 | 4 | . | 8 | 3 | 0 | |
| - | 1 | 8 | . | 9 | 6 | 5 | |
| 5 | . | 8 | 6 | 5 |
Subtract the numbers in the tens column from the top number:
1-1=0
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 1 | 13 | ||||||
| 3 | 17 | ||||||
| 7 | 12 | ||||||
| 2 | 10 | ||||||
| 1 | 2 | 4 | . | 8 | 3 | 0 | |
| - | 1 | 8 | . | 9 | 6 | 5 | |
| 0 | 5 | . | 8 | 6 | 5 |
Write 1 in the hundreds place.
| Place value | hundreds | tens | ones | . | tenths | hundredths | thousandths |
| 1 | 13 | ||||||
| 3 | 17 | ||||||
| 7 | 12 | ||||||
| 2 | 10 | ||||||
| 1 | 2 | 4 | . | 8 | 3 | 0 | |
| - | 1 | 8 | . | 9 | 6 | 5 | |
| 1 | 0 | 5 | . | 8 | 6 | 5 |
The solution is: 105.865
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