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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 387 · 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.The 5th of a month is a Sunday. What day is the 23rd of the same month? (a) Wednesday (b) Thursday (c) Friday (d) Sunday
  2. 2.Double 48 =
  3. 3.A father is 45 years old and his son is 4. How old was the father when the son was born?
  4. 4.Odd one out: which number is NOT in the 9 times table? (a) 73 (b) 36 (c) 18 (d) 45
  5. 5.1 + 2 + 3 + … + 27 =
  6. 6.Do the 1089 trick with 930: reverse and subtract, then reverse that answer and add. What do you get?
  7. 7.Double 81 =
  8. 8.Double 13 =
  9. 9.111111 × 111111 =
  10. 10.49 × 4 =
  11. 11.Magic square (every row, column and diagonal has the same total): 5 4 9 | 10 6 2 | ? 8 7. What is the missing number?
  12. 12.8 × 4 =
  13. 13.Double 65 =
  14. 14.9 × 7 = 6? — what is the missing digit?
  15. 15.9 × 10 =
  16. 16.If today is Saturday, what day was it 54 days ago? (a) Tuesday (b) Monday (c) Sunday (d) Thursday
  17. 17.1 + 3 + 5 + … + 19 =
  18. 18.In 5 years a boy will be 16 years old. How old was he 3 years ago?
  19. 19.Do the 1089 trick with 308: reverse and subtract, then reverse that answer and add. What do you get?
  20. 20.11 × 100 =
  21. 21.29 × 4 =
  22. 22.Magic trick! Think of 12. Double it, add 14, halve it, then take away 12. What number do you get?
  23. 23.9 × 3 = 2? — what is the missing digit?
  24. 24.1 + 3 + 5 + … + 21 =
  25. 25.54 × 4 =
  26. 26.39 × ? = 3900
  27. 27.66 × 100 =
  28. 28.Double 49 =
  29. 29.1 + 2 + 3 + … + 98 =
  30. 30.Take 197. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  31. 31.1 + 2 + 3 + … + 16 =
  32. 32.Take 72 and take away the sum of its digits. What do you get?
  33. 33.Half of 62 =
  34. 34.Take 94 and take away the sum of its digits. What do you get?
  35. 35.Take 34 and take away the sum of its digits. What do you get?
  36. 36.32 × 4 =
  37. 37.18 × 4 =
  38. 38.1 × 9 =
  39. 39.Half of 138 =
  40. 40.Magic square (every row, column and diagonal has the same total): 10 5 12 | 11 9 7 | ? 13 8. What is the missing number?

Answer key

  1. Thursday
  2. 96
  3. 41
  4. 73
  5. 378
  6. 1089
  7. 162
  8. 26
  9. 12345654321
  10. 196
  11. 3
  12. 32
  13. 130
  14. 3
  15. 90
  16. Monday
  17. 100
  18. 8
  19. 1089
  20. 1100
  21. 116
  22. 7
  23. 7
  24. 121
  25. 216
  26. 100
  27. 6600
  28. 98
  29. 4851
  30. 594
  31. 136
  32. 63
  33. 31
  34. 81
  35. 27
  36. 128
  37. 72
  38. 9
  39. 69
  40. 6

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