Solution - Long subtraction
20.47
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones | . | tenths | hundredths |
| 2 | 9 | . | 3 | 7 | |
| - | 8 | . | 9 | ||
| . |
Put zeros in the blank number places:
| Place value | tens | ones | . | tenths | hundredths |
| 2 | 9 | . | 3 | 7 | |
| - | 8 | . | 9 | 0 | |
| . |
2. Subtract the numbers using long subtraction method
Subtract the numbers in the hundredths column from the top number:
7-0=7
| Place value | tens | ones | . | tenths | hundredths |
| 2 | 9 | . | 3 | 7 | |
| - | 8 | . | 9 | 0 | |
| . | 7 |
Because the upper digit (3) in the tenths 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 (13).
| Place value | tens | ones | . | tenths | hundredths |
| 8 | 13 | ||||
| 2 | 9 | . | 3 | 7 | |
| - | 8 | . | 9 | 0 | |
| . | 7 |
Subtract the numbers in the tenths column from the top number:
13-9=4
| Place value | tens | ones | . | tenths | hundredths |
| 8 | 13 | ||||
| 2 | 9 | . | 3 | 7 | |
| - | 8 | . | 9 | 0 | |
| . | 4 | 7 |
Subtract the numbers in the ones column from the top number:
8-8=0
| Place value | tens | ones | . | tenths | hundredths |
| 8 | 13 | ||||
| 2 | 9 | . | 3 | 7 | |
| - | 8 | . | 9 | 0 | |
| 0 | . | 4 | 7 |
Write 2 in the tens place.
| Place value | tens | ones | . | tenths | hundredths |
| 8 | 13 | ||||
| 2 | 9 | . | 3 | 7 | |
| - | 8 | . | 9 | 0 | |
| 2 | 0 | . | 4 | 7 |
The solution is: 20.47
How did we do?
Please leave us feedback.Why learn this
Why learn this