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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 160 · 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. 1.55 × 4 =
  2. 2.9 × 2 = ?8 — what is the missing digit?
  3. 3.49 × 4 =
  4. 4.Take 86 and take away the sum of its digits. What do you get?
  5. 5.What comes next? 19, 24, 29, 34, ? (a) 39 (b) 40 (c) 44 (d) 34
  6. 6.Odd one out: which number is NOT in the 5 times table? (a) 38 (b) 35 (c) 25 (d) 20
  7. 7.11 × 4 =
  8. 8.12 × 8 + 2 =
  9. 9.Take 55 and take away the sum of its digits. What do you get?
  10. 10.3 × 1000 =
  11. 11.Half of 132 =
  12. 12.Magic square (every row, column and diagonal has the same total): 8 9 4 | 3 7 11 | 10 ? 6. What is the missing number?
  13. 13.What comes next? 3, 6, 12, 24, ? (a) 42 (b) 48 (c) 36 (d) 49
  14. 14.The 7th of a month is a Thursday. What day is the 17th of the same month? (a) Wednesday (b) Monday (c) Saturday (d) Sunday
  15. 15.I thought of a number, multiplied it by 3 and added 5. I got 29. What was my number?
  16. 16.198 + 891 =
  17. 17.9 × 3 = 2? — what is the missing digit?
  18. 18.Half of 112 =
  19. 19.Magic square (every row, column and diagonal has the same total): ? 15 10 | 13 11 9 | 12 7 14. What is the missing number?
  20. 20.What comes next? 4, 8, 16, 32, ? (a) 64 (b) 48 (c) 56 (d) 65
  21. 21.Think of 14. Multiply it by 2, then add 7. What number do you end with?
  22. 22.Do the 1089 trick with 922: reverse and subtract, then reverse that answer and add. What do you get?
  23. 23.29 × 4 =
  24. 24.Double 19 =
  25. 25.9 × 7 = ?3 — what is the missing digit?
  26. 26.I thought of a number, multiplied it by 2 and added 6. I got 30. What was my number?
  27. 27.If today is Thursday, what day was it 50 days ago? (a) Thursday (b) Saturday (c) Tuesday (d) Wednesday
  28. 28.A father is 31 years old and his son is 14. How old was the father when the son was born?
  29. 29.123 × 9 + 4 =
  30. 30.528? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.I thought of a number, added 9 and then doubled it. I got 30. What was my number?
  32. 32.What comes next? 8, 16, 24, 32, ? (a) 40 (b) 48 (c) 32 (d) 41
  33. 33.9 × 9 =
  34. 34.If today is Thursday, what day was it 57 days ago? (a) Wednesday (b) Saturday (c) Thursday (d) Tuesday
  35. 35.The 6th of a month is a Thursday. What day is the 30th of the same month? (a) Monday (b) Saturday (c) Wednesday (d) Sunday
  36. 36.9 × 10 = 9? — what is the missing digit?
  37. 37.Magic trick! Think of 8. Double it, add 8, halve it, then take away 8. What number do you get?
  38. 38.In 2 years a boy will be 14 years old. How old was he 7 years ago?
  39. 39.What comes next? 1, 4, 9, 16, ? (a) 23 (b) 25 (c) 26 (d) 27
  40. 40.12345679 × 18 =

Answer key

  1. 220
  2. 1
  3. 196
  4. 72
  5. 39
  6. 38
  7. 44
  8. 98
  9. 45
  10. 3000
  11. 66
  12. 5
  13. 48
  14. Sunday
  15. 8
  16. 1089
  17. 7
  18. 56
  19. 8
  20. 64
  21. 35
  22. 1089
  23. 116
  24. 38
  25. 6
  26. 12
  27. Wednesday
  28. 17
  29. 1111
  30. 3
  31. 6
  32. 40
  33. 81
  34. Wednesday
  35. Sunday
  36. 0
  37. 4
  38. 5
  39. 25
  40. 222222222

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