Writing a formula from a description

Building a formula from a worded rule, such as a charge with a fixed part.

Changing the subject of a formula

Rearranging a formula so a different letter stands alone on one side.

Rearranging with squares and roots

Changing the subject when it sits inside a square, a root or a fraction.

The subject appearing twice

Gathering both copies of the subject on one side, then factorising it out.

Higher

Practice

Changing the subject of a formula

Rearranging a formula so a different letter stands alone on one side.

Practice

Rearranging with squares and roots

Changing the subject when it sits inside a square, a root or a fraction.

Practice

Changing the subject review

Rearranging formulae, through squares, roots and a subject appearing twice.

Mixed review