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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 352 · 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. 1.56 × 4 =
  2. 2.1 + 2 + 3 + … + 30 =
  3. 3.45 × ? = 45000
  4. 4.Magic square (every row, column and diagonal has the same total): 13 28 7 | 10 16 22 | 25 ? 19. What is the missing number?
  5. 5.9 × 3 = 2? — what is the missing digit?
  6. 6.9 × 5 = ?5 — what is the missing digit?
  7. 7.9 × 10 = 9? — what is the missing digit?
  8. 8.9 × 8 = ?2 — what is the missing digit?
  9. 9.26 × 4 =
  10. 10.89?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.Magic square (every row, column and diagonal has the same total): 6 13 8 | 11 9 7 | 10 5 ?. What is the missing number?
  12. 12.Take 58 and take away the sum of its digits. What do you get?
  13. 13.A father is 43 years old and his son is 4. How old was the father when the son was born?
  14. 14.?341 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.9 × 6 = ?4 — what is the missing digit?
  16. 16.Half of 154 =
  17. 17.9 × 5 = 4? — what is the missing digit?
  18. 18.1 + 3 + 5 + … + 29 =
  19. 19.Half of 66 =
  20. 20.2 × 9 =
  21. 21.What comes next? 17, 26, 35, 44, ? (a) 44 (b) 53 (c) 62 (d) 54
  22. 22.Odd one out: which number is NOT in the 9 times table? (a) 18 (b) 54 (c) 45 (d) 87
  23. 23.9 × 9 =
  24. 24.30 × ? = 3000
  25. 25.9 × 8 =
  26. 26.Magic square (every row, column and diagonal has the same total): 24 10 20 | 14 18 ? | 16 26 12. What is the missing number?
  27. 27.What comes next? 16, 25, 34, 43, ? (a) 53 (b) 43 (c) 52 (d) 61
  28. 28.What comes next? 25, 36, 49, 64, ? (a) 79 (b) 83 (c) 82 (d) 81
  29. 29.9 × 10 =
  30. 30.23 × 4 =
  31. 31.A father is 35 years old and his son is 6. How old was the father when the son was born?
  32. 32.I thought of a number, added 8 and then doubled it. I got 48. What was my number?
  33. 33.18 × 1000 =
  34. 34.Take 41 and take away the sum of its digits. What do you get?
  35. 35.42 × 4 =
  36. 36.148 × ? = 1480
  37. 37.9 × 7 = 6? — what is the missing digit?
  38. 38.83 × 10 =
  39. 39.The ages of two twins add up to 24. How old is each twin?
  40. 40.17 × 4 =

Answer key

  1. 224
  2. 465
  3. 1000
  4. 4
  5. 7
  6. 4
  7. 0
  8. 7
  9. 104
  10. 3
  11. 12
  12. 45
  13. 39
  14. 1
  15. 5
  16. 77
  17. 5
  18. 225
  19. 33
  20. 18
  21. 53
  22. 87
  23. 81
  24. 100
  25. 72
  26. 22
  27. 52
  28. 81
  29. 90
  30. 92
  31. 29
  32. 16
  33. 18000
  34. 36
  35. 168
  36. 10
  37. 3
  38. 830
  39. 12
  40. 68

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