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
  • No sign-up
  • +10 XP per level
  • 5 levels
  • Plays on all devices
  • Grade-by-grade

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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.

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.
  • EnglandNational Curriculum in England: mathematics · algebra, functions, fluencyAligned to algebra, functions, fluency number and operations objectives.
  • AustraliaAustralian Curriculum: Mathematics (Version 9.0) · algebra, functions, fluencyAligned to algebra, functions, fluency number and operations objectives.
  • Canada (Ontario)The Ontario Curriculum, Grades 1–8: Mathematics (2020) · algebra, functions, fluencyAligned to algebra, functions, fluency number and operations objectives.
❓ FAQ

Common questions from parents & teachers

Everything you need to know before your child starts playing.

  • It is designed for ages 13 to 14 (grade 8 and grade 9).

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