You are Here: Home >< Maths

# Maths

1. Reciprocal meaning? How would i calculate the reciprocal of 2.5?
2. 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
3. (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.
4. (Original post by questioner...)
Reciprocal meaning? How would i calculate the reciprocal of 2.5?

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.
5. (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.
6. (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

## Register

Thanks for posting! You just need to create an account in order to submit the post
1. this can't be left blank
2. this can't be left blank
3. this can't be left blank

6 characters or longer with both numbers and letters is safer

4. this can't be left empty
1. Oops, you need to agree to our Ts&Cs to register

Updated: October 6, 2016
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Today on TSR

Is this true?

Poll
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams