Fun Math Kids

Young Geniuses · Ages 13 to 14

All Young Geniuses games

Inverse Function Speed

Evaluate inverse functions against a timer in a time reversal research program, for ages 13 to 14.

SpeedFind the inverse of functions timed~2 min per level5 levelsAll devices
  • Free · no account required
  • COPPA compliant
  • +10 XP per level
  • 5 levels
  • Plays on all devices
  • Curriculum-aligned

The learning journey

Every activity is one step. Here is where this one fits.

  1. Play(you are here)Learn the idea in a game
  2. PractiseLock it in on paper
  3. ReviewCome back and keep it sharp
  4. MasterTake on a harder challenge
  5. AchieveEarn a certificate

About Inverse Function Speed

Inverse Function Speed runs in a time reversal research program, where undoing a function sends the experiment backwards through time. Evaluating f inverse by reversing the operations of f builds the function fluency of the GCSE Higher curriculum, and the friendly timer rewards both speed and accuracy as the reverse-flow systems power up. It is built for ages 13 to 14 (grade 8 and grade 9, GCSE Higher) with clear instructions, large touch targets, and progressive difficulty, so students can work independently or alongside a parent. Correct answers bring encouraging feedback and a small celebration, while mistakes are never punished and simply invite another try, which keeps confidence high. The challenge grows step by step so it always matches the learner, supporting steady progress across the upper-secondary and GCSE Higher curriculum used in the US, UK, Canada, and Australia. The game runs in any modern browser with no app to install, no sign-up, and no advertising shown to children. Progress is saved only on the device and appears in the Parent Dashboard, so families can follow growth without any data leaving the browser. It pairs well with our Young Geniuses worksheets for offline practice of the same skills.

Chosen by the skills this activity practises.

A hand for grown-ups

Before you start
Find a calm few minutes with no rush. Let your child know it is fine to find some of it tricky — that is what practice is for.
While they work
Sit nearby but let them lead. If they get stuck, ask "what could you try?" rather than giving the answer — the thinking is the point.
Afterwards
Ask them to show you one they found easy and one they found hard. Praise the effort on the hard one, not just the right answers.
Watch out for
Rushing. If answers come too fast and wrong, slow the pace down together rather than pushing for more.
Away from the screen
Look for the same maths in everyday life — counting stairs, sharing snacks, spotting shapes on a walk.

How to play

  1. A question appears on screen

    An equation with a missing answer — for example "4 + 1 = ?" — is shown in large text. A timer bar starts counting down from 16 seconds.

  2. Tap or press the correct answer

    Four answer options are shown as large buttons. Tap an answer, or press keys 1–4 on the keyboard.

  3. Build your streak

    Each consecutive correct answer increases your streak counter. A streak of 5 or more turns the flame icon orange and awards a streak bonus to your XP for that level.

  4. Complete the level to finish

    Each level has 6 questions. Complete them correctly to earn the full level XP (+10 XP, plus up to +10 XP perfect bonus). Your progress is saved automatically between sessions.

🎓 Curriculum

Curriculum alignment

Mapped to national curriculum frameworks so teachers and parents can match practice to school standards.

  • United StatesCommon Core State Standards for Mathematics · algebra, functions, fluencyAligned to algebra, functions, fluency number and operations objectives.
  • United KingdomNational Curriculum for England — Maths · algebra, functions, fluencyAligned to algebra, functions, fluency number and operations objectives.
  • AustraliaAustralian Curriculum v9.0 — Mathematics · algebra, functions, fluencyAligned to algebra, functions, fluency number and operations objectives.
  • CanadaPan-Canadian Provincial Standards · algebra, functions, fluencyAligned to algebra, functions, fluency number and operations objectives.
❓ FAQ

Frequently Asked Questions

  • It is designed for ages 13 to 14 (grade 8 and grade 9, GCSE Higher) and follows the upper-secondary curriculum.

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