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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 60 · 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. 1.9 × 10 = 9? — what is the missing digit?
  2. 2.Magic square (every row, column and diagonal has the same total): 12 9 24 | 27 15 3 | 6 21 ?. What is the missing number?
  3. 3.693 + 396 =
  4. 4.13 × 4 =
  5. 5.60 × 4 =
  6. 6.What comes next? 1, 2, 4, 8, ? (a) 14 (b) 16 (c) 12 (d) 17
  7. 7.Take 17 and take away the sum of its digits. What do you get?
  8. 8.?013 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.Magic trick! Think of 8. Double it, add 8, halve it, then take away 8. What number do you get?
  10. 10.What comes next? 4, 8, 16, 32, ? (a) 56 (b) 64 (c) 65 (d) 48
  11. 11.If today is Monday, what day was it 56 days ago? (a) Thursday (b) Sunday (c) Tuesday (d) Monday
  12. 12.Odd one out: which number is NOT in the 9 times table? (a) 56 (b) 54 (c) 27 (d) 18
  13. 13.39 × 4 =
  14. 14.?434 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.Magic square (every row, column and diagonal has the same total): 9 2 7 | 4 6 8 | ? 10 3. What is the missing number?
  16. 16.Take 12 and take away the sum of its digits. What do you get?
  17. 17.3 × 9 =
  18. 18.12345679 × 27 =
  19. 19.If today is Saturday, what day will it be after 88 days? (a) Saturday (b) Tuesday (c) Wednesday (d) Thursday
  20. 20.If today is Friday, what day was it 46 days ago? (a) Thursday (b) Monday (c) Tuesday (d) Sunday
  21. 21.9 × 8 = ?2 — what is the missing digit?
  22. 22.6 × 100 =
  23. 23.What comes next? 4, 9, 16, 25, ? (a) 37 (b) 38 (c) 34 (d) 36
  24. 24.I thought of a number, added 5 and then doubled it. I got 36. What was my number?
  25. 25.If today is Monday, what day was it 19 days ago? (a) Saturday (b) Thursday (c) Wednesday (d) Tuesday
  26. 26.I thought of a number, multiplied it by 5 and added 1. I got 31. What was my number?
  27. 27.45 × 4 =
  28. 28.26?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.47 × 4 =
  30. 30.Take 511. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  31. 31.22?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.What comes next? 15, 22, 29, 36, ? (a) 43 (b) 36 (c) 44 (d) 50
  33. 33.Magic trick! Think of 19. Double it, add 6, halve it, then take away 19. What number do you get?
  34. 34.Do the 1089 trick with 390: reverse and subtract, then reverse that answer and add. What do you get?
  35. 35.1 + 2 + 3 + … + 17 =
  36. 36.22 × 4 =
  37. 37.36 × ? = 3600
  38. 38.16 × 4 =
  39. 39.If today is Saturday, what day was it 44 days ago? (a) Friday (b) Sunday (c) Wednesday (d) Thursday
  40. 40.12 × 9 + 3 =

Answer key

  1. 0
  2. 18
  3. 1089
  4. 52
  5. 240
  6. 16
  7. 9
  8. 5
  9. 4
  10. 64
  11. Monday
  12. 56
  13. 156
  14. 7
  15. 5
  16. 9
  17. 27
  18. 333333333
  19. Wednesday
  20. Monday
  21. 7
  22. 600
  23. 36
  24. 13
  25. Wednesday
  26. 6
  27. 180
  28. 6
  29. 188
  30. 396
  31. 6
  32. 43
  33. 3
  34. 1089
  35. 153
  36. 88
  37. 100
  38. 64
  39. Thursday
  40. 111

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