Big 4
A 5-minute numeracy warm-up for every lesson. One number, four operations — instant mental maths practice for ages 4 to 16.
How Big 4 Works
✓ Choose a level from 28 progressive levels
✓ A random number appears instantly
✓ Four operations to work out mentally
✓ Tap to reveal one answer or all of them
✓ Full-screen mode for classroom display
✓ Keyboard shortcuts for wireless presenters
✓ Print as a worksheet — same or mixed numbers
✓ Streak counter for student motivation
✓ Works on desktop, tablet and phone
How to Use Big 4
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Teachers
Ideal as a 5-minute lesson starter or plenary. Project in full-screen mode and use keyboard shortcuts (Space to reveal, N for new number, arrow keys to change level).
Tip: Use Worksheet (Mixed) to give each table group a different number to work on!
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Students
Ideal for building number confidence and fluency. Pick a level, tap New Number, work out all four answers in your head, then tap to check. Try to build a streak!
Tip: Reveal one box at a time — try to get all four right before moving on.
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Parents
Ideal for quick daily maths practice — no preparation needed. The 28 levels cover ages 4 to 16, so just pick the right band for your child and let them go.
Tip: Start one level below where you think they are — confidence first, then challenge.
Big 4
Pick a level. Get a number. Do the four operations. How fast can you go?