Solution - Long subtraction
7888.4
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | thousands | hundreds | tens | ones | . | tenths |
| 7 | 8 | 9 | 7 | . | 4 | |
| - | 9 | |||||
| . |
Put zeros in the blank number places:
| Place value | thousands | hundreds | tens | ones | . | tenths |
| 7 | 8 | 9 | 7 | . | 4 | |
| - | 9 | . | 0 | |||
| . |
2. Subtract the numbers using long subtraction method
Subtract the numbers in the tenths column from the top number:
4-0=4
| Place value | thousands | hundreds | tens | ones | . | tenths |
| 7 | 8 | 9 | 7 | . | 4 | |
| - | 9 | . | 0 | |||
| . | 4 |
Because the upper digit (7) in the ones column is too small to get a positive difference, borrow 1 from the digit (9) in the next number place which becomes (8) and get (17).
| Place value | thousands | hundreds | tens | ones | . | tenths |
| 8 | 17 | |||||
| 7 | 8 | 9 | 7 | . | 4 | |
| - | 9 | . | 0 | |||
| . | 4 |
Subtract the numbers in the ones column from the top number:
17-9=8
| Place value | thousands | hundreds | tens | ones | . | tenths |
| 8 | 17 | |||||
| 7 | 8 | 9 | 7 | . | 4 | |
| - | 9 | . | 0 | |||
| 8 | . | 4 |
Write 8 in the tens place.
| Place value | thousands | hundreds | tens | ones | . | tenths |
| 8 | 17 | |||||
| 7 | 8 | 9 | 7 | . | 4 | |
| - | 9 | . | 0 | |||
| 8 | 8 | . | 4 |
Write 8 in the hundreds place.
| Place value | thousands | hundreds | tens | ones | . | tenths |
| 8 | 17 | |||||
| 7 | 8 | 9 | 7 | . | 4 | |
| - | 9 | . | 0 | |||
| 8 | 8 | 8 | . | 4 |
Write 7 in the thousands place.
| Place value | thousands | hundreds | tens | ones | . | tenths |
| 8 | 17 | |||||
| 7 | 8 | 9 | 7 | . | 4 | |
| - | 9 | . | 0 | |||
| 7 | 8 | 8 | 8 | . | 4 |
The solution is: 7888.4
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