Adding Unlike Fractions |
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To add unlike fractions (fractions with different denominators), create new fractions with like denominators, then add and simplify. |

How do we add the two fractions shown below?

Figure 1. |
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Multiply each fraction by a fraction that has the same denominator as the fraction it's being multiplied by. Sound confusing? Look below:

Figure 2. |
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We can multiply by (8/8) and (5/5) because they're equal to 1, and don't change the overall value.

Figure 3. |
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Subtracting Unlike Fractions |
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To subtract unlike fractions (fractions with different denominators), create new fractions with like denominators, then subtract and simplify. |

How do we subtract the two fractions shown below?

Figure 4. |
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Again, multiply each fraction by a fraction that has the same denominator as the fraction it's being multiplied by. Sound confusing? Look below:

Figure 5. |
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We can multiply by (8/8) and (5/5) because they're equal to 1, and don't change the overall value.

Figure 6. |
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