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Brainlag Learn / GCSE Maths

Formulae and rearranging

Substitute into formulae, write your own, change the subject (including when it appears twice) and use rearranged formulae from science and finance.

Lessons

  1. Substituting into formulaePut numbers into a formula and work it out in the right order, with negatives, squares and roots. 20 min, with the Scientific Calculator, free
  2. Writing formulaeTurn a rule in words or a diagram into a formula, keep the units straight, then use it. 20 min, free
  3. Changing the subjectRearrange a formula so a different letter is on its own, by undoing the operations in reverse order. 25 min, with the Scientific Calculator, Plus
  4. When the subject appears twiceCollect every term with the new subject on one side, factorise it out, then divide. 25 min, Plus, Higher tier
  5. Using formulaeFind any quantity in a formula from science or finance: rearrange first, or substitute and solve. 25 min, with the Scientific Calculator, Plus

Practise and test

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