Join TSR now and get all your revision questions answeredSign up now

Maths

    • Thread Starter
    Offline

    1
    ReputationRep:
    Reciprocal meaning? How would i calculate the reciprocal of 2.5?
    Offline

    2
    ReputationRep:
    The reciprocal is 1/x so the reciprocal would be 1/2.5 which is 2/5 because when you multiply this by the original you should get 1.

    So: The reciprocal of x is 1/x. When multiplied: 1/x * x = 1
    Offline

    0
    ReputationRep:
    (Original post by questioner...)
    Reciprocal meaning? How would i calculate the reciprocal of 2.5?
    I don't know the exact meaning of a reciprocal, but it basically means turning the given number into an upside down fraction (if that makes any sense).

    So, the reciprocal of 2.5, which in a fraction term is 5/2, will be 2/5.
    Offline

    3
    ReputationRep:
    (Original post by questioner...)
    Reciprocal meaning? How would i calculate the reciprocal of 2.5?
    Google is your friend.

    A reciprocal value is a value you multiply by to get 1. It's also commonly seen as flipping the top and bottom of a fraction. For example the reciprocal of 2 (also represented as 2/1) is 1/2.

    Write 2.5 as a fraction. Flip said fraction. You now have a reciprocal. To check it works multiply the 2 fractions together to get 1. And that's the simple explanation of reciprocals that can also be found by Googling it.
    Offline

    3
    ReputationRep:
    (Original post by questioner...)
    Reciprocal meaning? How would i calculate the reciprocal of 2.5?
    A reciprocal of a number is defined as the number that when multiplied by the initial number gives 1.

    So if x is a number and x* is its reciprocal, xx*=1.

    Hence x*=1/x.

    So for any number x, to calculate its reciprocal, just take 1 and divide it by x.

    So the rest reciprocal of 2.5 is 1/2.5=0.4 because 2.5*0.4=1.
    Offline

    3
    ReputationRep:
    (Original post by questioner...)
    Reciprocal meaning? How would i calculate the reciprocal of 2.5?
    Lots of ways to look at it as seen above
    the reciprocal of a number is that number to the power of -1
    The reciprocal of 2 is 1/2 or 0.5

    The reciprocal of 2.5 is the fraction 1/2.5 - though you'd not leave the answer as a fraction with a decimal number in it.
    An alternative approach is to write it the number first as a top heavy fraction
    2.5 = 5/2 as a fraction.
    The reciprocal would then be 2/5


    Posted from TSR Mobile
 
 
 
Write a reply… Reply
Submit reply
Updated: October 6, 2016
Poll
Which party will you be voting for in the General Election 2017?
Useful resources

Make your revision easier

Maths

Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

Equations

How to use LaTex

Writing equations the easy way

Student revising

Study habits of A* students

Top tips from students who have already aced their exams

Study Planner

Create your own Study Planner

Never miss a deadline again

Polling station sign

Thinking about a maths degree?

Chat with other maths applicants

Can you help? Study help unanswered threads

Groups associated with this forum:

View associated groups

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Quick reply
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.