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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 596 · 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. 1.1 + 2 + 3 + … + 38 =
  2. 2.Double 83 =
  3. 3.11 × 11 =
  4. 4.Odd one out: which number is NOT in the 9 times table? (a) 20 (b) 54 (c) 36 (d) 18
  5. 5.9 × 5 = ?5 — what is the missing digit?
  6. 6.Double 91 =
  7. 7.1 + 2 + 3 + … + 32 =
  8. 8.What comes next? 4, 9, 16, 25, ? (a) 37 (b) 38 (c) 34 (d) 36
  9. 9.Half of 12 =
  10. 10.50 × 4 =
  11. 11.If today is Thursday, what day will it be after 84 days? (a) Wednesday (b) Friday (c) Thursday (d) Sunday
  12. 12.31 × 4 =
  13. 13.I thought of a number, added 9 and then doubled it. I got 34. What was my number?
  14. 14.If today is Monday, what day was it 32 days ago? (a) Wednesday (b) Friday (c) Sunday (d) Thursday
  15. 15.1 + 3 + 5 + … + 21 =
  16. 16.I thought of a number, multiplied it by 4 and added 8. I got 16. What was my number?
  17. 17.15 × 4 =
  18. 18.123456 × 9 + 7 =
  19. 19.865? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.I thought of a number, multiplied it by 2 and added 2. I got 22. What was my number?
  21. 21.9 × 7 = ?3 — what is the missing digit?
  22. 22.If today is Thursday, what day will it be after 35 days? (a) Thursday (b) Friday (c) Sunday (d) Wednesday
  23. 23.1 + 2 + 3 + … + 37 =
  24. 24.5?30 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.Double 47 =
  26. 26.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
  27. 27.7?52 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.9 × 7 = 6? — what is the missing digit?
  29. 29.16 × 4 =
  30. 30.If today is Thursday, what day was it 15 days ago? (a) Thursday (b) Saturday (c) Tuesday (d) Wednesday
  31. 31.9 × 3 = 2? — what is the missing digit?
  32. 32.Double 34 =
  33. 33.Double 17 =
  34. 34.Magic square (every row, column and diagonal has the same total): 15 30 ? | 12 18 24 | 27 6 21. What is the missing number?
  35. 35.What comes next? 1, 2, 4, 8, ? (a) 14 (b) 16 (c) 12 (d) 17
  36. 36.Magic trick! Think of 13. Double it, add 8, halve it, then take away 13. What number do you get?
  37. 37.What comes next? 5, 10, 20, 40, ? (a) 81 (b) 60 (c) 70 (d) 80
  38. 38.12345679 × 18 =
  39. 39.20 × ? = 2000
  40. 40.38 × 4 =

Answer key

  1. 741
  2. 166
  3. 121
  4. 20
  5. 4
  6. 182
  7. 528
  8. 36
  9. 6
  10. 200
  11. Thursday
  12. 124
  13. 8
  14. Thursday
  15. 121
  16. 2
  17. 60
  18. 1111111
  19. 8
  20. 10
  21. 6
  22. Thursday
  23. 703
  24. 1
  25. 94
  26. 495
  27. 4
  28. 3
  29. 64
  30. Wednesday
  31. 7
  32. 68
  33. 34
  34. 9
  35. 16
  36. 4
  37. 80
  38. 222222222
  39. 100
  40. 152

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