About this worksheet

This free Year 7 substitution worksheet is written for the Western Australian curriculum and mapped to SCSA content description WA7MNAA4. It targets one skill so students can practise until it sticks: by the end, students can say “I can substitute values into algebraic expressions and everyday formulas, using the correct order of operations.”

What’s inside

• Key idea box – a short explanation with worked examples to read before starting.
• A · Fluency (16 questions) – quick practice to build accuracy.
• B · Core (10 questions) – worded problems set in everyday Australian contexts.
• C · Reasoning (4 questions) – explain, justify and spot the error.
• D · Challenge (4 questions) – harder multi-step and problem-solving questions for students ready to stretch.
• Separate marking key – every answer with working, plus mark allocations and marking criteria for reasoning questions.

Skills covered

• Substituting values into algebraic expressions
• Evaluating everyday formulas
• Applying the order of operations with powers and brackets

How to use this worksheet

Start with the Key idea box, then complete Section A without a calculator. Most students should attempt Sections B and C; Section D suits students aiming for the top of the class or preparing for accelerated or extension maths. The worksheet is marked out of 55, and the score box on the last page helps students see which section needs more practice.

Common mistakes to watch for

• Writing 3a as 34 when a = 4
• Ignoring the order of operations
• Squaring before multiplying incorrectly (3x² vs (3x)²)
• Substituting into the wrong letter

Where this fits in the WA Year 7 sequence

Substitution sits in the Algebraic techniques sub-strand of Number and algebra. It is one of a set of short, single-skill EduLift worksheets that split each Year 7 content description into sub-skills. Use the previous and next links to work through the sequence in order.

Common errors we see in tutoring

• Writing 3a as 34 when a = 4
• Ignoring the order of operations
• Squaring before multiplying incorrectly (3x² vs (3x)²)
• Substituting into the wrong letter