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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 327 · 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.I thought of a number, multiplied it by 4 and added 8. I got 28. What was my number?
  2. 2.Magic trick! Think of 11. Double it, add 8, halve it, then take away 11. What number do you get?
  3. 3.Odd one out: which number is NOT in the 5 times table? (a) 40 (b) 10 (c) 25 (d) 17
  4. 4.12 × 8 + 2 =
  5. 5.2?16 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.3 × ? = 300
  7. 7.Double 97 =
  8. 8.Magic trick! Think of 17. Double it, add 14, halve it, then take away 17. What number do you get?
  9. 9.9 × 2 = 1? — what is the missing digit?
  10. 10.If today is Tuesday, what day was it 52 days ago? (a) Friday (b) Tuesday (c) Saturday (d) Sunday
  11. 11.1 × 9 =
  12. 12.9 × 10 = 9? — what is the missing digit?
  13. 13.What comes next? 1, 8, 15, 22, ? (a) 22 (b) 30 (c) 36 (d) 29
  14. 14.9 × 6 = 5? — what is the missing digit?
  15. 15.198 + 891 =
  16. 16.17 × 4 =
  17. 17.10 × 4 =
  18. 18.71 × 100 =
  19. 19.Do the 1089 trick with 800: reverse and subtract, then reverse that answer and add. What do you get?
  20. 20.Double 62 =
  21. 21.What comes next? 4, 8, 16, 32, ? (a) 56 (b) 65 (c) 64 (d) 48
  22. 22.Take 129. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  23. 23.9 × 8 =
  24. 24.11111 × 11111 =
  25. 25.30 × 4 =
  26. 26.The 9th of a month is a Friday. What day is the 29th of the same month? (a) Friday (b) Thursday (c) Sunday (d) Wednesday
  27. 27.Odd one out: which number is NOT in the 4 times table? (a) 11 (b) 16 (c) 8 (d) 28
  28. 28.Magic square (every row, column and diagonal has the same total): 4 9 8 | 11 7 ? | 6 5 10. What is the missing number?
  29. 29.897 × 10 =
  30. 30.9 × 10 = ?0 — what is the missing digit?
  31. 31.The 9th of a month is a Saturday. What day is the 20th of the same month? (a) Wednesday (b) Saturday (c) Tuesday (d) Thursday
  32. 32.What comes next? 12, 20, 28, 36, ? (a) 36 (b) 44 (c) 45 (d) 52
  33. 33.12 × 9 + 3 =
  34. 34.?488 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.Half of 192 =
  36. 36.Magic trick! Think of 9. Double it, add 12, halve it, then take away 9. What number do you get?
  37. 37.Magic square (every row, column and diagonal has the same total): 24 27 12 | 9 ? 33 | 30 15 18. What is the missing number?
  38. 38.If today is Friday, what day was it 58 days ago? (a) Thursday (b) Wednesday (c) Saturday (d) Tuesday
  39. 39.I thought of a number, added 3 and then doubled it. I got 20. What was my number?
  40. 40.What comes next? 9, 16, 25, 36, ? (a) 50 (b) 47 (c) 49 (d) 51

Answer key

  1. 5
  2. 4
  3. 17
  4. 98
  5. 9
  6. 100
  7. 194
  8. 7
  9. 8
  10. Saturday
  11. 9
  12. 0
  13. 29
  14. 4
  15. 1089
  16. 68
  17. 40
  18. 7100
  19. 1089
  20. 124
  21. 64
  22. 792
  23. 72
  24. 123454321
  25. 120
  26. Thursday
  27. 11
  28. 3
  29. 8970
  30. 9
  31. Wednesday
  32. 44
  33. 111
  34. 7
  35. 96
  36. 6
  37. 21
  38. Wednesday
  39. 7
  40. 49

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