| 39 |
| 84 |
| 18 |
| 20 |
| -61 |
| 140 |
| 39 |
| 84 |
| 18 |
| 20 |
In order to make fractions have the same denominator, multiply the numerator and denominator of each fraction by the denominator of the other
| 39 x 20 |
| 84 x 20 |
| 18 x 84 |
| 20 x 84 |
| 780 |
| 1680 |
| 1512 |
| 1680 |
| 780 - 1512 |
| 1680 |
| -732 |
| 1680 |
OR
| (39 x 20) - (18 x 84) |
| 84 x 20 |
| -732 |
| 1680 |
Divide each part of the fraction with the greatest common factor to simplify the fraction
| -732 |
| 1680 |
| -732 ÷ 12 |
| 1680 ÷ 12 |
| 61 |
| 140 |
Positive Fractions
| -1 |
| -2 |
| 1 |
| -2 |
| -1 |
| 2 |
| 1 |
| 2 |
Negative Fractions
| -1 |
| 2 |
| 1 |
| -2 |
| -1 |
| -2 |
| 1 |
| 2 |