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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 502 · 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.What comes next? 1, 2, 4, 8, ? (a) 16 (b) 12 (c) 17 (d) 14
  2. 2.123 × 8 + 3 =
  3. 3.46 × 4 =
  4. 4.I thought of a number, multiplied it by 2 and added 4. I got 12. What was my number?
  5. 5.Double 69 =
  6. 6.1 × 9 =
  7. 7.193? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.30? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.479 × 10 =
  10. 10.Magic square (every row, column and diagonal has the same total): 8 9 4 | 3 ? 11 | 10 5 6. What is the missing number?
  11. 11.Half of 186 =
  12. 12.4 × 9 =
  13. 13.?63 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.Odd one out: which number is NOT in the 9 times table? (a) 54 (b) 81 (c) 79 (d) 36
  15. 15.Half of 32 =
  16. 16.Take 87 and take away the sum of its digits. What do you get?
  17. 17.23 × 4 =
  18. 18.Do the 1089 trick with 341: reverse and subtract, then reverse that answer and add. What do you get?
  19. 19.12345679 × 36 =
  20. 20.81 × ? = 810
  21. 21.1 + 3 + 5 + … + 47 =
  22. 22.9 × ? = 900
  23. 23.9 × 4 =
  24. 24.The 5th of a month is a Saturday. What day is the 24th of the same month? (a) Wednesday (b) Friday (c) Thursday (d) Sunday
  25. 25.9 × 6 =
  26. 26.Take 76 and take away the sum of its digits. What do you get?
  27. 27.Half of 126 =
  28. 28.1 + 2 + 3 + … + 61 =
  29. 29.Take 23 and take away the sum of its digits. What do you get?
  30. 30.1 + 3 + 5 + … + 23 =
  31. 31.What comes next? 4, 10, 16, 22, ? (a) 34 (b) 29 (c) 22 (d) 28
  32. 32.1 + 2 + 3 + … + 38 =
  33. 33.3?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.40 × 4 =
  35. 35.If today is Friday, what day was it 25 days ago? (a) Sunday (b) Tuesday (c) Thursday (d) Monday
  36. 36.9 × 1 =
  37. 37.Think of 15. Multiply it by 4, then add 8. What number do you end with?
  38. 38.Half of 152 =
  39. 39.1 + 2 + 3 + … + 75 =
  40. 40.Magic square (every row, column and diagonal has the same total): 8 ? 12 | 18 14 10 | 16 6 20. What is the missing number?

Answer key

  1. 16
  2. 987
  3. 184
  4. 4
  5. 138
  6. 9
  7. 5
  8. 6
  9. 4790
  10. 7
  11. 93
  12. 36
  13. 9
  14. 79
  15. 16
  16. 72
  17. 92
  18. 1089
  19. 444444444
  20. 10
  21. 576
  22. 100
  23. 36
  24. Thursday
  25. 54
  26. 63
  27. 63
  28. 1891
  29. 18
  30. 144
  31. 28
  32. 741
  33. 1
  34. 160
  35. Monday
  36. 9
  37. 68
  38. 76
  39. 2850
  40. 22

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