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Fraction and decimal operationsFact

Fact

Fraction and decimal operations

Common denominators to add, flip and multiply to divide

2 min 2 steps

Adding fractions straight across looks like a shortcut. I've tried every shortcut through this building, and that one dead-ends at a wrong answer.

Common denominators and reciprocalsLearn it
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Used by

Clear fractions and decimalsTechniqueMultiply every term once and the fractions are gone
Rational expressionsTechniqueFactor, then cancel factors or share a denominator
Solve a proportionTechniqueCross-multiply, or scale one fraction into the other