Solution - Long subtraction
Step-by-step explanation
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | ones | . | tenths | hundredths | thousandths | ten thousandths | hundred thousandths | millionths |
| 0 | . | 0 | 0 | 4 | ||||
| - | 0 | . | 0 | 0 | 0 | 0 | 9 | 8 |
| . |
Put zeros in the blank number places:
| Place value | ones | . | tenths | hundredths | thousandths | ten thousandths | hundred thousandths | millionths |
| 0 | . | 0 | 0 | 4 | 0 | 0 | 0 | |
| - | 0 | . | 0 | 0 | 0 | 0 | 9 | 8 |
| . |
2. Subtract the numbers using long subtraction method
Because the upper digit (0) in the millionths column is too small to get a positive difference, borrow 1 from the number to the left (400) which becomes (399) and get (10).
| Place value | ones | . | tenths | hundredths | thousandths | ten thousandths | hundred thousandths | millionths |
| 3 | 9 | 9 | 10 | |||||
| 0 | . | 0 | 0 | 4 | 0 | 0 | 0 | |
| - | 0 | . | 0 | 0 | 0 | 0 | 9 | 8 |
| . |
Subtract the numbers in the millionths column from the top number:
10-0-8=2
| Place value | ones | . | tenths | hundredths | thousandths | ten thousandths | hundred thousandths | millionths |
| 3 | 9 | 9 | 10 | |||||
| 0 | . | 0 | 0 | 4 | 0 | 0 | 0 | |
| - | 0 | . | 0 | 0 | 0 | 0 | 9 | 8 |
| . | 2 |
Subtract the numbers in the hundred thousandths column from the top number:
9-9=0
| Place value | ones | . | tenths | hundredths | thousandths | ten thousandths | hundred thousandths | millionths |
| 3 | 9 | 9 | 10 | |||||
| 0 | . | 0 | 0 | 4 | 0 | 0 | 0 | |
| - | 0 | . | 0 | 0 | 0 | 0 | 9 | 8 |
| . | 0 | 2 |
Subtract the numbers in the ten thousandths column from the top number:
9-0=9
| Place value | ones | . | tenths | hundredths | thousandths | ten thousandths | hundred thousandths | millionths |
| 3 | 9 | 9 | 10 | |||||
| 0 | . | 0 | 0 | 4 | 0 | 0 | 0 | |
| - | 0 | . | 0 | 0 | 0 | 0 | 9 | 8 |
| . | 9 | 0 | 2 |
Subtract the numbers in the thousandths column from the top number:
3-0=3
| Place value | ones | . | tenths | hundredths | thousandths | ten thousandths | hundred thousandths | millionths |
| 3 | 9 | 9 | 10 | |||||
| 0 | . | 0 | 0 | 4 | 0 | 0 | 0 | |
| - | 0 | . | 0 | 0 | 0 | 0 | 9 | 8 |
| . | 3 | 9 | 0 | 2 |
Subtract the numbers in the hundredths column from the top number:
0-0=0
| Place value | ones | . | tenths | hundredths | thousandths | ten thousandths | hundred thousandths | millionths |
| 3 | 9 | 9 | 10 | |||||
| 0 | . | 0 | 0 | 4 | 0 | 0 | 0 | |
| - | 0 | . | 0 | 0 | 0 | 0 | 9 | 8 |
| . | 0 | 3 | 9 | 0 | 2 |
Subtract the numbers in the tenths column from the top number:
0-0=0
| Place value | ones | . | tenths | hundredths | thousandths | ten thousandths | hundred thousandths | millionths |
| 3 | 9 | 9 | 10 | |||||
| 0 | . | 0 | 0 | 4 | 0 | 0 | 0 | |
| - | 0 | . | 0 | 0 | 0 | 0 | 9 | 8 |
| . | 0 | 0 | 3 | 9 | 0 | 2 |
Subtract the numbers in the ones column from the top number:
0-0=0
| Place value | ones | . | tenths | hundredths | thousandths | ten thousandths | hundred thousandths | millionths |
| 3 | 9 | 9 | 10 | |||||
| 0 | . | 0 | 0 | 4 | 0 | 0 | 0 | |
| - | 0 | . | 0 | 0 | 0 | 0 | 9 | 8 |
| 0 | . | 0 | 0 | 3 | 9 | 0 | 2 |
The solution is: 0.003902
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