  # Use BIDMAS to Solve Calculations Involving Fractions

In this worksheet, students will use the correct order of operations to arrive at answers to problems involving fractions Key stage:  KS 3

Curriculum topic:   Number

Curriculum subtopic:   Use Calculators/Technology for Accuracy

Difficulty level:   #### Worksheet Overview

In this activity, we will be using BIDMAS to do calculations in the correct order.

The order of operations is:

Brackets

Powers or indices

Division

Multiplication

Subtraction

In the examples below, we can see how doing a calculation in a different order, can give a completely different answer.

3 × 42 = 3 × 16 = 48

or

(3 × 4)2 = 122 = 144

−52 = −25  = (−(5 × 5))

or

(−5)2 = +25 = (−5) × (−5)

When using BIDMAS with fractions as in the questions that follow, we treat the numerator and the denominator separately and only divide the top number by the bottom number once the rest of the calculation has been done.

Let's try some questions.

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