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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 358 · 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. 1.4 × 9 =
  2. 2.12 × 1000 =
  3. 3.12345679 × 27 =
  4. 4.1 + 2 + 3 + … + 33 =
  5. 5.3 × 9 =
  6. 6.82 × ? = 8200
  7. 7.Double 61 =
  8. 8.Take 72 and take away the sum of its digits. What do you get?
  9. 9.What comes next? 16, 23, 30, 37, ? (a) 51 (b) 44 (c) 45 (d) 37
  10. 10.Magic square (every row, column and diagonal has the same total): 10 5 6 | 3 7 ? | 8 9 4. What is the missing number?
  11. 11.Take 60 and take away the sum of its digits. What do you get?
  12. 12.I thought of a number, multiplied it by 4 and added 6. I got 46. What was my number?
  13. 13.9 × 4 =
  14. 14.59 × 4 =
  15. 15.71 × 100 =
  16. 16.31 × 10 =
  17. 17.12345679 × 45 =
  18. 18.Magic square (every row, column and diagonal has the same total): 6 11 10 | ? 9 5 | 8 7 12. What is the missing number?
  19. 19.13 × 4 =
  20. 20.49 × 100 =
  21. 21.10 × ? = 1000
  22. 22.26 × 4 =
  23. 23.9 × 2 = ?8 — what is the missing digit?
  24. 24.9 × 1000 =
  25. 25.Magic square (every row, column and diagonal has the same total): 6 27 ? | 21 15 9 | 18 3 24. What is the missing number?
  26. 26.495 + 594 =
  27. 27.1 + 2 + 3 + … + 14 =
  28. 28.7?04 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.What comes next? 3, 6, 12, 24, ? (a) 49 (b) 42 (c) 36 (d) 48
  30. 30.33 × 4 =
  31. 31.26? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.Double 14 =
  33. 33.Double 25 =
  34. 34.Magic square (every row, column and diagonal has the same total): 13 14 9 | 8 ? 16 | 15 10 11. What is the missing number?
  35. 35.7 × 9 =
  36. 36.Odd one out: which number is NOT in the 6 times table? (a) 30 (b) 27 (c) 24 (d) 36
  37. 37.A father is 30 years old and his son is 4. How old was the father when the son was born?
  38. 38.Think of 14. Multiply it by 3, then add 8. What number do you end with?
  39. 39.52 × 4 =
  40. 40.What comes next? 1, 5, 9, 13, ? (a) 17 (b) 13 (c) 21 (d) 18

Answer key

  1. 36
  2. 12000
  3. 333333333
  4. 561
  5. 27
  6. 100
  7. 122
  8. 63
  9. 44
  10. 11
  11. 54
  12. 10
  13. 36
  14. 236
  15. 7100
  16. 310
  17. 555555555
  18. 13
  19. 52
  20. 4900
  21. 100
  22. 104
  23. 1
  24. 9000
  25. 12
  26. 1089
  27. 105
  28. 7
  29. 48
  30. 132
  31. 1
  32. 28
  33. 50
  34. 12
  35. 63
  36. 27
  37. 26
  38. 50
  39. 208
  40. 17

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