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using a common denominator that isnt the least which can sometimes cause errors

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they needed to multiply the numerators first to get equal denominators, then add them

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adding with different denominators

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What must be done to the denominator must be done to the numerator.

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They try to add the denominators together.

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They forget to apply the LCD to the numerator

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Students can make an error by multiplying the rational expressions by the LCD instead of trying to make the denominators the same.

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Not multiplying for the LCD but rather adding the denominators

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they might try to add denominators instead of find the LCD.

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They needed to multiply the numerator correctly based on the denominator

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Students forget to find the LCD before adding resulting in the wrong answer

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someone could have the wrong LCD

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Multiplying the rational expressions by the LCD rather than what makes the denominators match

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Example of adding a rational expression