Solution - Long subtraction
84.9
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
Place value | hundreds | tens | ones | . | tenths |
1 | 0 | 0 | |||
- | 1 | 5 | . | 1 | |
. |
Put zeros in the blank number places:
Place value | hundreds | tens | ones | . | tenths |
1 | 0 | 0 | . | 0 | |
- | 1 | 5 | . | 1 | |
. |
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 number to the left (100) which becomes (099) and get (10).
Place value | hundreds | tens | ones | . | tenths |
0 | 9 | 10 | |||
1 | 0 | 0 | . | 0 | |
- | 1 | 5 | . | 1 | |
. |
Subtract the numbers in the tenths column from the top number:
10-0-1=9
Place value | hundreds | tens | ones | . | tenths |
0 | 9 | 10 | |||
1 | 0 | 0 | . | 0 | |
- | 1 | 5 | . | 1 | |
. | 9 |
Subtract the numbers in the ones column from the top number:
9-5=4
Place value | hundreds | tens | ones | . | tenths |
0 | 9 | 10 | |||
1 | 0 | 0 | . | 0 | |
- | 1 | 5 | . | 1 | |
4 | . | 9 |
Subtract the numbers in the tens column from the top number:
9-1=8
Place value | hundreds | tens | ones | . | tenths |
0 | 9 | 10 | |||
1 | 0 | 0 | . | 0 | |
- | 1 | 5 | . | 1 | |
8 | 4 | . | 9 |
Write 0 in the hundreds place.
Place value | hundreds | tens | ones | . | tenths |
0 | 9 | 10 | |||
1 | 0 | 0 | . | 0 | |
- | 1 | 5 | . | 1 | |
0 | 8 | 4 | . | 9 |
The solution is: 84.9
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