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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 covering OCR GCSE Maths Substitution for Foundation and Higher tier. Each lesson works through exam-style questions in the written papers format. 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.

Lessons