G S Rehill's Interactive Maths Software Series - "Building a Strong Foundation in Mathematics" from mathsteacher.com.au.

Order a 12-month Year 7 Interactive Maths software Homework Licence for only $19.95. Order a 12-month Year 8 Interactive Maths software Homework Licence for only $19.95. Order a 12-month Year 9 Interactive Maths software Homework Licence for only $19.95. Order a 12-month Year 10 Interactive Maths software Homework Licence for only $19.95.

Year 7 Interactive Maths - Second Edition


The Reciprocal of a Number

1/3 is called the reciprocal of 3 and 3 is called the reciprocal of 1/3.

One number is the reciprocal of another if their product is 1.

For example, the reciprocal of 5/6 is 6/5 since 5/6  6/5 is 1.


In general:

The reciprocal of a fraction is obtained by interchanging the numerator and the denominator, i.e. by inverting the fraction.


Example 7

Find the reciprocal of 20.

Solution:
Reciprocal of 20 is 1/20.


Example 8

Find the reciprocal of 3/7.

Solution:
Reciprocal of 3/7 is 2 1/3.


Example 9

Find the reciprocal of 1 1/3.

Solution:
Reciprocal of 1 1/3 is 3/4.

Note:

To find the reciprocal of a mixed number, change it into an improper fraction and then invert it.


Key Term

reciprocal


| Home Page | Order Maths Software | About the Series | Maths Software Tutorials |
| Year 7 Maths Software | Year 8 Maths Software | Year 9 Maths Software | Year 10 Maths Software |
| Homework Software | Laptop Schools | Tutor Software | Maths Software Platform | Trial Maths Software |
| Feedback | About mathsteacher.com.au | Terms and Conditions | Our Policies | Links | Contact |

Copyright 2000-2014 mathsteacher.com Pty Ltd.  All rights reserved.
Australian Business Number 53 056 217 611

Copyright instructions for educational institutions

Please read the Terms and Conditions of Use of this Website and our Privacy and Other Policies.
If you experience difficulties when using this Website, tell us through the feedback form or by phoning the contact telephone number.