Vocabulary: expression, equation, formula, identity

Sample Vocabulary: expression, equation, formula, identity questions

A few of the 52 questions, from easier to harder. Choose your exam board and tier to practise them, with every answer marked.

1. Question 11 markGrade 1-2
   Is $3x + 2$ an expression, an equation, a formula, or an identity?
   Show the worked solution

   $3x + 2$ has no equals sign, so it cannot be an equation, formula, or identity. It is simply a collection of terms - an expression.
2. Question 2

What are the common mistakes in Vocabulary: expression, equation, formula, identity?

When a pupil makes one of these on Revision Workshop, the marking engine names the mistake and explains it, instead of just marking the answer wrong.

• Treats an identity (true for all values) as if it were an equation with a unique solution

  Treated a statement that's true for every value of x as if it only held for particular values - expanding the brackets shows the two sides are algebraically identical, so it's an identity, not an equation.

• Confuses a general formula with a specific equation

  This connects three different variables (energy, mass, speed of light) as a general rule, rather than being solved for one specific numerical unknown

• Confuses an expression with an equation

  There is no equals sign here, so this cannot be an equation, formula, or identity - it is simply an expression

Quick answers about Vocabulary: expression, equation, formula, identity

How many Vocabulary: expression, equation, formula, identity practice questions are there?

There are 52 self-marking GCSE and IGCSE Maths questions on Vocabulary: expression, equation, formula, identity, written for AQA, Pearson, OCR, Pearson International GCSE Maths A (4MA1), Cambridge IGCSE Mathematics (0580), Cambridge IGCSE (9-1) Mathematics (0980) across Foundation and Higher and Core and Extended tier. Each one is marked instantly and has a full worked solution.

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