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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 329 · 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.Magic square (every row, column and diagonal has the same total): 7 12 11 | 14 10 6 | 9 ? 13. What is the missing number?
  2. 2.The 5th of a month is a Monday. What day is the 19th of the same month? (a) Monday (b) Tuesday (c) Sunday (d) Thursday
  3. 3.1 + 3 + 5 + … + 19 =
  4. 4.56 × 4 =
  5. 5.Magic square (every row, column and diagonal has the same total): 12 2 16 | 14 10 ? | 4 18 8. What is the missing number?
  6. 6.9 × 10 =
  7. 7.411? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.If today is Sunday, what day was it 32 days ago? (a) Thursday (b) Tuesday (c) Wednesday (d) Saturday
  9. 9.12 × 9 + 3 =
  10. 10.728 × ? = 7280
  11. 11.9 × 3 = 2? — what is the missing digit?
  12. 12.What comes next? 25, 36, 49, 64, ? (a) 83 (b) 81 (c) 82 (d) 79
  13. 13.I thought of a number, multiplied it by 2 and added 5. I got 15. What was my number?
  14. 14.8?21 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.1 + 2 + 3 + … + 24 =
  16. 16.1 + 3 + 5 + … + 29 =
  17. 17.30 × 4 =
  18. 18.9 × 7 =
  19. 19.9 × 9 = 8? — what is the missing digit?
  20. 20.Magic square (every row, column and diagonal has the same total): 13 23 21 | 27 19 ? | 17 15 25. What is the missing number?
  21. 21.Double 58 =
  22. 22.Half of 92 =
  23. 23.31 × 4 =
  24. 24.1 + 3 + 5 + … + 39 =
  25. 25.9 × 8 = 7? — what is the missing digit?
  26. 26.Double 41 =
  27. 27.111 × 111 =
  28. 28.1 + 3 + 5 + … + 43 =
  29. 29.A father is 35 years old and his son is 13. How old was the father when the son was born?
  30. 30.9 × 5 = 4? — what is the missing digit?
  31. 31.38 × 4 =
  32. 32.9 × 2 = ?8 — what is the missing digit?
  33. 33.Magic square (every row, column and diagonal has the same total): 14 24 10 | 12 16 20 | ? 8 18. What is the missing number?
  34. 34.Half of 128 =
  35. 35.6 × 9 =
  36. 36.Do the 1089 trick with 772: reverse and subtract, then reverse that answer and add. What do you get?
  37. 37.33 × 100 =
  38. 38.A piggy bank has 6 coins of ₹5 and 11 coins of ₹2. How many rupees are in it?
  39. 39.9 × 1 =
  40. 40.I thought of a number, multiplied it by 5 and added 6. I got 71. What was my number?

Answer key

  1. 8
  2. Monday
  3. 100
  4. 224
  5. 6
  6. 90
  7. 3
  8. Wednesday
  9. 111
  10. 10
  11. 7
  12. 81
  13. 5
  14. 7
  15. 300
  16. 225
  17. 120
  18. 63
  19. 1
  20. 11
  21. 116
  22. 46
  23. 124
  24. 400
  25. 2
  26. 82
  27. 12321
  28. 484
  29. 22
  30. 5
  31. 152
  32. 1
  33. 22
  34. 64
  35. 54
  36. 1089
  37. 3300
  38. 52
  39. 9
  40. 13

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