# Substitution Starter Questions

## Substitution Practice Worksheets

Substitution worksheets for gcse maths for year 7, year 8 and year 9. This page contains 9 substitution worksheets including questions on substituting into expressions as well as questions on substituting into formulae. Substitution worksheet 1 targets grade 1 for year 7 and substitution worksheet 9 targets year 8 at gcse foundation.

## What Does It Mean to Substitute In Math?

In maths we can substitute into expressions and we can substitute into formulae. Expressions do not have an equals sign whereas formulas equal to something. The table below shows the expressions 5a, a - 5, 16 - a, 7a + 3. The value of a is 2. The answer is 10, -3, 14 and 17.

The graphic below shows the expressions 6y - 13, y2, 27 - 5y and ½y - 1.5. The answers are 5, 9, 12 and 0.

## How to Substitute Values

The diagrams below show questions which substitute values for n. If n = 8 work out 4n. The answer is 32.

The image below shows 2(6n + 1) - 4. If n = 3 the answer is 34.

The image below shows (n + 7) / (n + 8). When n = 2 the answer is 0.9 since 9 ÷ 10 equals 0.9.

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For Trial And Improvement Cazoomy Worksheets try: Trial and Improvement Worksheets. For Simultaneous Equations Cazoomy Worksheets try: Simultaneous Equations Worksheets. For Inequalities Cazoomy Worksheets try: Inequalities Worksheets.