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# How do you find the missing numerator or denominator?

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To find a missing numerator or denominator of a fraction, another fraction of equal proportion must also be present so that a ratio can be set up and solved for the missing value. Ratio is just another term for a fraction, and ratios are used in the real world for things like doubling a cooking recipe.

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Credit: tamuc CC-BY 2.0

Ratio problems are solved by setting the two fractions equal to one another. After that, the fractions are cross-multiplied and the variable isolated. For example, in 2/3=x/6, the cross-multiplication gives 12=3x. The variable is then isolated by dividing both sides by 3 to get x=4.

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## Related Questions

• A:

To write a decimal as a fraction, first write a fraction with the decimal as the numerator and the integer one as the denominator. Then perform a mathematical operation on the fraction to get rid of the decimal point and simplify the fraction.

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To simplify a complex fraction, calculate common denominators for both the numerator and the denominator, combine like terms, and then solve the complex fraction by flipping the denominator to multiply. Dividing and multiplying are inverse operations, so flipping is the easiest way to solve.

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According to Math is Fun, the meaning of simplest form is the numerator, or the top number of a fraction, and the denominator, or the bottom number of a fraction, cannot be reduced any further while still remaining a whole number. The concept of simplest form only applies to fractions.