Subtraction of Fractions (Simple Steps)

Are you finding the subtraction of fractions hard to solve in JAMB and WAEC questions?

In this lesson…

You will learn the step-by-step method for the subtraction of fractions in your WAEC and JAMB exam question.

ALSO SEE: How To Solve The Addition Of Fractions (Simple Steps)

Take note.

A link for you to practice real exam past questions on fractions is included at the bottom of this lesson.

Steps in subtraction of fractions

  • Convert mixed to improper fraction.
  • Find their LCM.
  • Divide the LCM by the denominator.
  • Multiply by the numerator.
  • Subtract the numerators.
  • Reduce to its lowest form.

Let’s take an example.

Sample question


1. Convert the mixed fraction to improper fraction

3\frac{2}{3} (mixed fraction)

= \dfrac{11}{3} (improper fraction)



2. Find the LCM of the denominators

The LCM of 3 and 6

= 6

3. Write the LCM as your new denominator


4. Divide the LCM by each denominator

6 ÷ 3 = 2

6 ÷ 6 = 1

5. Multiply the answer by their numerator

2 × 11 = 22

1 × 1 = 1

6. Write the answers as new numerators


7. Subtract the new numerators


= \dfrac{21}{6}

8. Reduce to its lowest form


= \dfrac{7}{2}


Click on the link below to practice exam past questions on fractions now.

Practice Test

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