KS3 maths: Substitution, formulae and inequalities

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KS3 maths: Substitution, formulae and inequalities: 20 questions, marked instantly with every answer explained. Free, no sign-up, no adverts in the test. This test is for Years 7 to 9 (ages 11–14). In the US, that's Grade 6 to Grade 8.

Before you start

20 questions on substituting into expressions and formulae, changing the subject and solving inequalities, picked at random from a bank of 45, so every try is different. Type a number, or choose an answer. Some questions ask you to type an expression or an equation, such as 3(x + 2) or y = 2x − 1: any correct way of writing it counts, unless the question asks for a form (for example "factorise"). Questions with units tell you which unit to use. Choose Practice to see each answer explained as you go, or Test to see your score and explanations at the end.

20 questions – a new mix each time you try
Type algebra with the keyboard or the on-screen maths keys

Choose how to do it Test – answers and explanations at the end; no time limit Practice – see the answer after each question; no time limit

No sign-up and no adverts. Your answers stay on this device. Nothing you type in the test is sent to us – unless you choose to report a problem with a question.

How it is marked: by Classfern's own checks, in your browser, straight away. Typed algebra is marked by what it means, not by how it is spelled out, so equivalent answers count. Spot a mistake? Use the Report button.

Classfern practice material. Not an official test and not affiliated with or endorsed by the Department for Education or any exam board.

Curriculum: the key stage 3 programme of study covered here – substitute numerical values into formulae and expressions, including scientific formulae; understand and use the concepts and vocabulary of expressions, equations, inequalities, terms and factors; understand and use standard mathematical formulae; rearrange formulae to change the subject.

Contains public sector information licensed under the Open Government Licence v3.0. Curriculum statements from: Department for Education, National curriculum in England: mathematics programmes of study, © Crown copyright 2013.

Learn it first: Substitution (Year 9) · Rearranging formulae (Year 9) · Inequalities (Year 9)

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