Solution - Long subtraction
85990.1
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | ten thousands | thousands | hundreds | tens | ones | . | tenths |
| 8 | 6 | 0 | 0 | 0 | |||
| - | 9 | . | 9 | ||||
| . |
Put zeros in the blank number places:
| Place value | ten thousands | thousands | hundreds | tens | ones | . | tenths |
| 8 | 6 | 0 | 0 | 0 | . | 0 | |
| - | 9 | . | 9 | ||||
| . |
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 (6,000) which becomes (5,999) and get (10).
| Place value | ten thousands | thousands | hundreds | tens | ones | . | tenths |
| 5 | 9 | 9 | 10 | ||||
| 8 | 6 | 0 | 0 | 0 | . | 0 | |
| - | 9 | . | 9 | ||||
| . |
Subtract the numbers in the tenths column from the top number:
10-0-9=1
| Place value | ten thousands | thousands | hundreds | tens | ones | . | tenths |
| 5 | 9 | 9 | 10 | ||||
| 8 | 6 | 0 | 0 | 0 | . | 0 | |
| - | 9 | . | 9 | ||||
| . | 1 |
Subtract the numbers in the ones column from the top number:
9-9=0
| Place value | ten thousands | thousands | hundreds | tens | ones | . | tenths |
| 5 | 9 | 9 | 10 | ||||
| 8 | 6 | 0 | 0 | 0 | . | 0 | |
| - | 9 | . | 9 | ||||
| 0 | . | 1 |
Write 9 in the tens place.
| Place value | ten thousands | thousands | hundreds | tens | ones | . | tenths |
| 5 | 9 | 9 | 10 | ||||
| 8 | 6 | 0 | 0 | 0 | . | 0 | |
| - | 9 | . | 9 | ||||
| 9 | 0 | . | 1 |
Write 9 in the hundreds place.
| Place value | ten thousands | thousands | hundreds | tens | ones | . | tenths |
| 5 | 9 | 9 | 10 | ||||
| 8 | 6 | 0 | 0 | 0 | . | 0 | |
| - | 9 | . | 9 | ||||
| 9 | 9 | 0 | . | 1 |
Write 5 in the thousands place.
| Place value | ten thousands | thousands | hundreds | tens | ones | . | tenths |
| 5 | 9 | 9 | 10 | ||||
| 8 | 6 | 0 | 0 | 0 | . | 0 | |
| - | 9 | . | 9 | ||||
| 5 | 9 | 9 | 0 | . | 1 |
Write 8 in the ten thousands place.
| Place value | ten thousands | thousands | hundreds | tens | ones | . | tenths |
| 5 | 9 | 9 | 10 | ||||
| 8 | 6 | 0 | 0 | 0 | . | 0 | |
| - | 9 | . | 9 | ||||
| 8 | 5 | 9 | 9 | 0 | . | 1 |
The solution is: 85990.1
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