  # Using a Calculator to Find Reciprocals of Numbers

In this worksheet, students practise finding reciprocals of numbers using a calculator. Key stage:  KS 3

Curriculum topic:   Number

Curriculum subtopic:   Use Calculators/Technology for Accuracy

Difficulty level:   #### Worksheet Overview

What is a reciprocal?

Well, a reciprocal is a <b>multiplicative inverse</b> of a number.

But what does that mean?

This means that when a number paired with its reciprocal and then multiplied together will give an answer of 1

How do we find the reciprocal?

Put simply, the reciprocal of a number is 1 divided by the number.

Example

The reciprocal of 20 is 1 &divide; 20 = 0.05.

The reciprocal of 0.2 is 1&divide; 0.2 = 5

The reciprocal of 2/3 is 1 &divide; 2/3 = 3/2

You can either work out 1 ÷ 20 or use the reciprocal button 1/x or x-1 on the calculator.

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