# Grouping formulae by changing the subject

Last updated: 15/11/2023
Contributor: Bob Jackson
Main Subject
Key stage
Category
Algebra: Algebraic skills
Inside
Resource type
Student activity

Thirty-two cards with eight different formulae, given with four different subjects. Students must rearrange the formulae to organise them into eight groups of four equivalent formulae, each with a different subject.

Formulae include fractions, quadratic terms and roots.

Extend the activity by omitting some cards or check answers by substituting values.

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### All reviews

Have you used this resource?

'@Vicky - surely the square root would inherently have a positive and negative solution? Writing the positive and negative square root almost masks this fact.

Tom Mee

14/01/2020

It would also be very useful to number or label each card, to allow for easier checking of answers

Vicky Dumsday

13/10/2017

This is a great task to use at the end of teaching of this topic, but when square rooting, the answers should include the positive and negative square roots. Students would lose marks for only showing one solution.

Vicky Dumsday

13/10/2017

Perfect extension for those that have understood this topic well in class

06/09/2016

'@Vicky - surely the square root would inherently have a positive and negative solution? Writing the positive and negative square root almost masks this fact.

Tom Mee

14/01/2020

It would also be very useful to number or label each card, to allow for easier checking of answers

Vicky Dumsday

13/10/2017

This is a great task to use at the end of teaching of this topic, but when square rooting, the answers should include the positive and negative square roots. Students would lose marks for only showing one solution.

Vicky Dumsday

13/10/2017

Perfect extension for those that have understood this topic well in class

06/09/2016