The Math Meridian
Back to Grade 4

Digit and number puzzles

Questions at easy, medium and hard levels. Pick a level and get a fresh set every time, with instant feedback.

Learn it Work backwards to undo operations. For consecutive numbers, the middle one is the total ÷ how many.

Example: I think of a number, multiply by 3 and subtract 4. I get 26. What is it?

  1. Undo − 4: $26 + 4 = 30$.
  2. Undo × 3: $30 \div 3 = 10$.
  3. The number is 10. Check: $10 \times 3 - 4 = 26$ ✓.

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