Solution - Long subtraction
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | tens | ones | . | tenths | hundredths | thousandths | ten thousandths |
| 4 | 0 | . | 0 | 0 | 8 | ||
| - | 2 | 9 | . | 0 | 9 | 4 | 1 |
| . |
Put zeros in the blank number places:
| Place value | tens | ones | . | tenths | hundredths | thousandths | ten thousandths |
| 4 | 0 | . | 0 | 0 | 8 | 0 | |
| - | 2 | 9 | . | 0 | 9 | 4 | 1 |
| . |
2. Subtract the numbers using long subtraction method
Because the upper digit (0) in the ten thousandths 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 (10).
| Place value | tens | ones | . | tenths | hundredths | thousandths | ten thousandths |
| 7 | 10 | ||||||
| 4 | 0 | . | 0 | 0 | 8 | 0 | |
| - | 2 | 9 | . | 0 | 9 | 4 | 1 |
| . |
Subtract the numbers in the ten thousandths column from the top number:
10-0-1=9
| Place value | tens | ones | . | tenths | hundredths | thousandths | ten thousandths |
| 7 | 10 | ||||||
| 4 | 0 | . | 0 | 0 | 8 | 0 | |
| - | 2 | 9 | . | 0 | 9 | 4 | 1 |
| . | 9 |
Subtract the numbers in the thousandths column from the top number:
7-4=3
| Place value | tens | ones | . | tenths | hundredths | thousandths | ten thousandths |
| 7 | 10 | ||||||
| 4 | 0 | . | 0 | 0 | 8 | 0 | |
| - | 2 | 9 | . | 0 | 9 | 4 | 1 |
| . | 3 | 9 |
Because the upper digit (0) in the hundredths column is too small to get a positive difference, borrow 1 from the number to the left (40.0) which becomes (39.9) and get (10).
| Place value | tens | ones | . | tenths | hundredths | thousandths | ten thousandths |
| 3 | 9 | 9 | 10 | ||||
| 7 | 10 | ||||||
| 4 | 0 | . | 0 | 0 | 8 | 0 | |
| - | 2 | 9 | . | 0 | 9 | 4 | 1 |
| . | 3 | 9 |
Subtract the numbers in the hundredths column from the top number:
10-9=1
| Place value | tens | ones | . | tenths | hundredths | thousandths | ten thousandths |
| 3 | 9 | 9 | 10 | ||||
| 7 | 10 | ||||||
| 4 | 0 | . | 0 | 0 | 8 | 0 | |
| - | 2 | 9 | . | 0 | 9 | 4 | 1 |
| . | 1 | 3 | 9 |
Subtract the numbers in the tenths column from the top number:
9-0=9
| Place value | tens | ones | . | tenths | hundredths | thousandths | ten thousandths |
| 3 | 9 | 9 | 10 | ||||
| 7 | 10 | ||||||
| 4 | 0 | . | 0 | 0 | 8 | 0 | |
| - | 2 | 9 | . | 0 | 9 | 4 | 1 |
| . | 9 | 1 | 3 | 9 |
Subtract the numbers in the ones column from the top number:
9-9=0
| Place value | tens | ones | . | tenths | hundredths | thousandths | ten thousandths |
| 3 | 9 | 9 | 10 | ||||
| 7 | 10 | ||||||
| 4 | 0 | . | 0 | 0 | 8 | 0 | |
| - | 2 | 9 | . | 0 | 9 | 4 | 1 |
| 0 | . | 9 | 1 | 3 | 9 |
Subtract the numbers in the tens column from the top number:
3-2=1
| Place value | tens | ones | . | tenths | hundredths | thousandths | ten thousandths |
| 3 | 9 | 9 | 10 | ||||
| 7 | 10 | ||||||
| 4 | 0 | . | 0 | 0 | 8 | 0 | |
| - | 2 | 9 | . | 0 | 9 | 4 | 1 |
| 1 | 0 | . | 9 | 1 | 3 | 9 |
The solution is: 10.9139
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