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Substitution
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What substitution means

What substitution means

Annotated substitution example showing 2a + 5b with a = 6 and b = 4, arrows to 2(6) + 5(4), then to 12 + 20 = 32

Algebra uses letters to stand for numbers. Substitution means replacing each letter with its given number and then working out the value.

Substitution Lesson

  1. GCSE
  2. /Maths
  3. /Substitution

Step-by-step lessons on AQA GCSE Maths Substitution. Each one builds up to exam-style questions. Build fluency with number, ratio and algebra first, since geometry, probability and statistics topics rely on them, and leave extra time nearer the exam for Higher-tier problem-solving and multi-step reasoning questions.