| 12 |
| 17 |
| 88 |
| 90 |
| -208 |
| 765 |
| 12 |
| 17 |
| 88 |
| 90 |
In order to make fractions have the same denominator, multiply the numerator and denominator of each fraction by the denominator of the other
| 12 x 90 |
| 17 x 90 |
| 88 x 17 |
| 90 x 17 |
| 1080 |
| 1530 |
| 1496 |
| 1530 |
| 1080 - 1496 |
| 1530 |
| -416 |
| 1530 |
OR
| (12 x 90) - (88 x 17) |
| 17 x 90 |
| -416 |
| 1530 |
Divide each part of the fraction with the greatest common factor to simplify the fraction
| -416 |
| 1530 |
| -416 ÷ 2 |
| 1530 ÷ 2 |
| 208 |
| 765 |
Positive Fractions
| -1 |
| -2 |
| 1 |
| -2 |
| -1 |
| 2 |
| 1 |
| 2 |
Negative Fractions
| -1 |
| 2 |
| 1 |
| -2 |
| -1 |
| -2 |
| 1 |
| 2 |