Mixed trick challenge — Maths trick for kids

The trick

Choose a trick — “look at the question first, then pick the trick that fits”

1. × 9 → finger trick; × 4 → double double; × 10, 100, 1000 → slide and add zeros.
2. 37, 12345679 or 111… → magic patterns; reverse and subtract → 1089.
3. Puzzles: find the rule, the total or the leftover days, then check your answer.

Use it for: Maths quizzes, Olympiad practice, and showing off your tricks to family and friends.

Worked example: 12345679 × 18 = 222222222

✏️ Practice

Work it out in your head or on paper, type the answer and press Check. Stuck? Press “Show me how”.

🏁 Trick 15 test

20 questions. Check each answer, then go to the next one. Get 16 or more right to pass.

🏅 Sign in with Google to earn the 🏆 Trick Champion badge when you pass — and a certificate when you finish all 5 tricks of Part 3 · Puzzles & quick wins. You can still take the test without signing in.

🖨️ Maths Tricks Practice Worksheet

• Worksheet set 1 (PDF)
• Worksheet set 2 (PDF)
• Worksheet set 3 (PDF)