Method #1
Expand the denominator to be a power of 10.
Example #1
3/5 is expanded to 6/10 by multiplying the numerator by 2 and denominator by 2:
| 3 | = | 3×2 | = | 6 | = | 0.6 |
| 5 | 5×2 | 10 |
Example #2
3/4 is expanded to 75/100 by multiplying the numerator by 25 and denominator by 25:
| 3 | = | 3×25 | = | 75 | = | 0.75 |
| 4 | 4×25 | 100 |
Example #3
5/8 is expanded to 625/1000 by multiplying the numerator by 125 and denominator by 125:
| 5 | = | 5×125 | = | 625 | = | 0.625 |
| 8 | 8×125 | 1000 |
Method #2
- Use calculator.
- Calculate the fraction's numerator divided by the fraction's denominator.
- For mixed numbers add the integer.
Example #1
2/5 = 2÷5 = 0.4
Example #2
1 2/5 = 1+2÷5 = 1.4
Method #3
Calculate long division of the fraction's numerator divided by the fraction's denominator.
Example
Calculate 3/4 by long division of 3 divided by 4:
| 0.75 | |
| 4 | 3 |
| 0 | |
| 30 | |
| 28 | |
| 20 | |
| 20 | |
| 0 |
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