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Fraction Operations Lessons

Subtract Fractions: Learn

How to Subtract Fractions with different denominators:

  • Rename the fractions using their Least Common Denominator (LCD)
  • Subtract the numerators of the fractions
  • Simplify the Fraction

Example: Subtract 3/12 - 2/9. The LCD is 36, so we can rename and subtract them them as follows:

3 * 3
12 * 3
-
2 * 4
9 * 4
=
9
36
-
8
36
=
1
36

In this case, the fraction does not simplify, so 17/36 is the final answer.

Subtract Fractions: Practice

Subtract the fractions.

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State the answer as a simplified fraction, and not a mixed number.

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