AlgebraDeep Dive

Method: How to Substitute

Part of Simplifying Expressions · GCSE GCSE Mathematics revision

This deep dive covers Method: How to Substitute within Simplifying Expressions for GCSE Mathematics. Revise Simplifying Expressions in Algebra for GCSE Mathematics with 11 exam-style questions and 5 flashcards. Use this page as part of a wider topic revision path rather than treating it as an isolated fact. It is section 9 of 19 in this topic. Use this deep dive to connect the idea to the wider topic before moving on to questions and flashcards.

Topic position

Section 9 of 19

Practice

11 questions

Recall

5 flashcards

Method: How to Substitute

Write out the expression

Copy it exactly as given

Replace each letter with its value

Use brackets around the number, especially for negatives!

Follow BIDMAS to calculate

Brackets, Indices, Division/Multiplication, Addition/Subtraction

Write your final answer

Check it makes sense!

Keep building this topic

Read this section alongside the surrounding pages in Simplifying Expressions. That gives you the full topic sequence instead of a single isolated revision point.

What is Substitution?Key Rules to Remember What Does "Simplify" Mean?What Are "Like Terms"?

Practice Questions for Simplifying Expressions

Which two terms are like terms?

A. 3x and 3y
B. 2x² and 5x
C. 4ab and 7ba
D. 6 and 6x

1 markfoundation

Explain why 3x + 2x² cannot be simplified to 5x³.

2 markshigher

Quick Recall Flashcards

Like Terms

Terms with same letter and power: 2x and 5x are like terms

Substitution

Replace each letter with its given value, then calculate

11 questions on Simplifying Expressions — practise free

Instant marking, adaptive difficulty, and 5 spaced repetition flashcards. Free until your GCSEs.

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What is Substitution?

Key Rules to Remember