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Algebra · SS1

Expressions, formulae & change of subject

Using letters for numbers: simplifying expressions, substituting values and making a letter the subject.

Before this
Number foundations & fractions
Leads to
Linear & simultaneous equationsVariationSequences & series (AP, GP)Binary operationsFunctions

Learn

  1. 1Substituting and expandingLetters stand for numbers: put numbers in carefully, collect like terms, multiply out brackets without losing a term or a sign, and read function notation.Done20 min
  2. 2Factorising and algebraic fractionsTake out common factors, group in pairs, spot the difference of two squares, simplify, add and cancel algebraic fractions correctly, and split a fraction into partial fractions.Done22 min
  3. 3Changing the subject of a formulaGet one letter on its own by undoing what was done to it, last operation first, and handle roots, powers, fractions and a letter that appears twice.Done15 min

Practise

Answer expressions, formulae & change of subject questions one at a time. You'll know straight away whether you're right, with hints and the working step by step.

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Past questions (97)

From 1983–2025: 41 WAEC, 10 NECO, 46 JAMB. Theory questions first, then objective, newest first.

Theory (20)

Objective (77)