Finding the Reciprocal of an Algebraic Fraction
(KS3, Year 8)
The LessonTo find the reciprocal of an algebraic fraction, turn the fraction upside down.
Make the numerator the denominator, and the denominator the numerator.
How to Find the Reciprocal of an Algebraic Fraction
QuestionWhat is the reciprocal of the algebraic fraction below?
Make the numerator of the fraction the denominator of the reciprocal. In our example, the numerator of the fraction is x.
Make the denominator of the fraction the numerator of the reciprocal. In our example, the denominator of the fraction is y.
Answer:We have found the reciprocal of the fraction:
More Examples of Finding the Reciprocal of an Algebraic FractionAlgebraic fractions do not just contain single letters.
When an algebraic fraction has a number, we can find the reciprocal:
When an algebraic fraction has a term, we can find the reciprocal:
When an algebraic fraction has a expression, we can find the reciprocal:
Lesson SlidesThe slider below shows another real example of how to find the reciprocal of an algebraic fraction. Open the slider in a new tab
What Is an Algebraic Fraction?An algebraic fraction is a fraction which contains letters.
Reciprocal When the Numerator Is 1Consider an algebraic fraction where the numerator is 1:
By finding the reciprocal, the denominator becomes 1:
But a letter divided by 1 is itself:
The reciprocal of a fraction with a numerator of 1 is simply the denominator.
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