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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 308 · 40 questions
TalentJR

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

NameDateTime takenScore ___ / 40
  1. 1.I thought of a number, added 9 and then doubled it. I got 50. What was my number?
  2. 2.3 × 9 =
  3. 3.Magic square (every row, column and diagonal has the same total): ? 7 8 | 5 9 13 | 10 11 6. What is the missing number?
  4. 4.9 × 3 = ?7 — what is the missing digit?
  5. 5.35 × 4 =
  6. 6.84 × 100 =
  7. 7.Do the 1089 trick with 610: reverse and subtract, then reverse that answer and add. What do you get?
  8. 8.4 × 9 =
  9. 9.I thought of a number, added 7 and then doubled it. I got 26. What was my number?
  10. 10.1234 × 8 + 4 =
  11. 11.9 × 5 = 4? — what is the missing digit?
  12. 12.Take 77 and take away the sum of its digits. What do you get?
  13. 13.Do the 1089 trick with 910: reverse and subtract, then reverse that answer and add. What do you get?
  14. 14.Magic trick! Think of 16. Double it, add 18, halve it, then take away 16. What number do you get?
  15. 15.9 × 1 =
  16. 16.What comes next? 1, 2, 4, 8, ? (a) 14 (b) 16 (c) 12 (d) 17
  17. 17.611 × ? = 6110
  18. 18.If today is Monday, what day was it 41 days ago? (a) Friday (b) Monday (c) Wednesday (d) Tuesday
  19. 19.278 × 10 =
  20. 20.Double 36 =
  21. 21.7 × 9 =
  22. 22.What comes next? 3, 6, 9, 12, ? (a) 12 (b) 16 (c) 15 (d) 18
  23. 23.1 + 2 + 3 + … + 46 =
  24. 24.8 × 100 =
  25. 25.?451 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.Magic square (every row, column and diagonal has the same total): 6 1 ? | 7 5 3 | 2 9 4. What is the missing number?
  27. 27.9 × 4 = ?6 — what is the missing digit?
  28. 28.Magic square (every row, column and diagonal has the same total): 17 3 13 | 7 ? 15 | 9 19 5. What is the missing number?
  29. 29.59 × 4 =
  30. 30.227 × 10 =
  31. 31.123 × 9 + 4 =
  32. 32.9 × 7 = ?3 — what is the missing digit?
  33. 33.Odd one out: which number is NOT in the 9 times table? (a) 72 (b) 28 (c) 18 (d) 45
  34. 34.39 × 4 =
  35. 35.37 × 18 =
  36. 36.786 × ? = 7860
  37. 37.Double 81 =
  38. 38.9 × 4 = 3? — what is the missing digit?
  39. 39.111111 × 111111 =
  40. 40.Magic square (every row, column and diagonal has the same total): 9 8 13 | ? 10 6 | 7 12 11. What is the missing number?

Answer key

  1. 16
  2. 27
  3. 12
  4. 2
  5. 140
  6. 8400
  7. 1089
  8. 36
  9. 6
  10. 9876
  11. 5
  12. 63
  13. 1089
  14. 9
  15. 9
  16. 16
  17. 10
  18. Tuesday
  19. 2780
  20. 72
  21. 63
  22. 15
  23. 1081
  24. 800
  25. 8
  26. 8
  27. 3
  28. 11
  29. 236
  30. 2270
  31. 1111
  32. 6
  33. 28
  34. 156
  35. 666
  36. 10
  37. 162
  38. 6
  39. 12345654321
  40. 14

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