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Basic math

The foundation for everything else: arithmetic, fractions, decimals, percentages and number sense, for kids, teens and adults who want a refresher.

24 free sites · 21 in English.

1. Khan Academy – Arithmetic English khanacademy.org

   Addition through fractions and decimals, with practice.

   For: Elementary schoolMiddle & high school

2. Khan Academy – Pre-algebra English khanacademy.org

   Negative numbers, ratios, percentages and first equations.

   For: Elementary schoolMiddle & high school

3. Math is Fun English mathsisfun.com

   Simple, visual explanations with examples and puzzles.

   For: Elementary schoolMiddle & high school

4. OpenStax – Prealgebra 2e English openstax.org

   Free, peer-reviewed prealgebra textbook.

   For: Elementary schoolMiddle & high school

5. Corbettmaths English corbettmaths.com

   Videos, worksheets and daily practice questions.

   For: Middle & high school

6. Maths Genie English mathsgenie.co.uk

   Free lessons and exam-style questions by topic.

   For: Middle & high school

7. NRICH (University of Cambridge) English nrich.maths.org

   Rich problems and games that build reasoning.

   For: Elementary schoolMiddle & high school

8. Transum English transum.org

   Starters, puzzles and self-checking exercises.

   For: Elementary schoolMiddle & high school

9. Math Antics (YouTube) English youtube.com

   Clear, friendly videos on the basics.

   For: Elementary schoolMiddle & high school

10. Numberphile (YouTube) English youtube.com

    Videos about numbers that make math fun.

    For: General public

11. Math-Drills English math-drills.com

    Thousands of free printable worksheets.

    For: Elementary schoolMiddle & high school

12. Math Playground English mathplayground.com

    Logic games and word problems for kids.

    For: Elementary school

13. ThatQuiz English thatquiz.org

    Quick practice tests for arithmetic and fractions.

    For: Elementary schoolMiddle & high school

14. Purplemath English purplemath.com

    Practical lessons from basic math to algebra.

    For: Middle & high school

15. CK-12 English ck12.org

    Free interactive textbooks and practice.

    For: Middle & high school

16. Oak National Academy English thenational.academy

    Free video lessons covering the full school curriculum.

    For: Elementary schoolMiddle & high school

17. BBC Bitesize English bbc.co.uk

    Short lessons and quizzes for every school level.

    For: Elementary schoolMiddle & high school

18. Polypad (Amplify) Multilingual polypad.amplify.com

    Virtual manipulatives: fraction bars, tiles, balances.

    For: Elementary schoolMiddle & high school

19. Math Learning Center – Apps Multilingual mathlearningcenter.org

    Free visual tools: number lines, fractions and more.

    For: Elementary schoolMiddle & high school

20. GeoGebra – Resources Multilingual geogebra.org

    Thousands of interactive activities made by teachers.

    For: Elementary schoolMiddle & high school

21. Dr Frost Maths English drfrost.org

    Free lessons, practice and past papers.

    For: Middle & high school

22. Open Middle English openmiddle.com

    Open-ended problems that build number sense.

    For: Elementary schoolMiddle & high school

23. Visual Patterns English visualpatterns.org

    Picture patterns to reason about.

    For: Elementary schoolMiddle & high school

24. Would You Rather Math English wouldyourathermath.com

    Real-life math decisions to discuss.

    For: Elementary schoolMiddle & high school