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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 415 · 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? 18, 27, 36, 45, ? (a) 63 (b) 55 (c) 54 (d) 45
  2. 2.I thought of a number, multiplied it by 5 and added 2. I got 37. What was my number?
  3. 3.?586 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.Magic square (every row, column and diagonal has the same total): 26 29 14 | 11 23 35 | 32 ? 20. What is the missing number?
  5. 5.If today is Thursday, what day will it be after 69 days? (a) Tuesday (b) Thursday (c) Saturday (d) Wednesday
  6. 6.123 × 9 + 4 =
  7. 7.Double 22 =
  8. 8.123456 × 9 + 7 =
  9. 9.123 × 8 + 3 =
  10. 10.Magic trick! Think of 14. Double it, add 18, halve it, then take away 14. What number do you get?
  11. 11.I thought of a number, multiplied it by 2 and added 7. I got 23. What was my number?
  12. 12.Take 93 and take away the sum of its digits. What do you get?
  13. 13.1 + 2 + 3 + … + 73 =
  14. 14.950 × 10 =
  15. 15.45 × 4 =
  16. 16.1 + 3 + 5 + … + 9 =
  17. 17.Take 35 and take away the sum of its digits. What do you get?
  18. 18.A girl is 5 years old and her brother is 4 years older. How old will her brother be in 6 years?
  19. 19.9 × 6 = ?4 — what is the missing digit?
  20. 20.53 × 4 =
  21. 21.20 × 4 =
  22. 22.22 × 4 =
  23. 23.8 × 9 =
  24. 24.Half of 66 =
  25. 25.1111 × 1111 =
  26. 26.Magic square (every row, column and diagonal has the same total): 12 33 ? | 27 21 15 | 24 9 30. What is the missing number?
  27. 27.If today is Sunday, what day will it be after 62 days? (a) Friday (b) Sunday (c) Saturday (d) Tuesday
  28. 28.9 × 8 = ?2 — what is the missing digit?
  29. 29.1 × 9 =
  30. 30.891 + 198 =
  31. 31.The 6th of a month is a Sunday. What day is the 28th of the same month? (a) Tuesday (b) Monday (c) Thursday (d) Sunday
  32. 32.Magic square (every row, column and diagonal has the same total): 22 8 ? | 12 16 20 | 14 24 10. What is the missing number?
  33. 33.18 × 4 =
  34. 34.1 + 3 + 5 + … + 41 =
  35. 35.29 × 4 =
  36. 36.A girl is 9 years old and her brother is 3 years older. How old will her brother be in 7 years?
  37. 37.3 × 9 =
  38. 38.Magic square (every row, column and diagonal has the same total): 6 5 10 | 11 7 ? | 4 9 8. What is the missing number?
  39. 39.Half of 92 =
  40. 40.9 × 4 =

Answer key

  1. 54
  2. 7
  3. 8
  4. 17
  5. Wednesday
  6. 1111
  7. 44
  8. 1111111
  9. 987
  10. 9
  11. 8
  12. 81
  13. 2701
  14. 9500
  15. 180
  16. 25
  17. 27
  18. 15
  19. 5
  20. 212
  21. 80
  22. 88
  23. 72
  24. 33
  25. 1234321
  26. 18
  27. Saturday
  28. 7
  29. 9
  30. 1089
  31. Monday
  32. 18
  33. 72
  34. 441
  35. 116
  36. 19
  37. 27
  38. 3
  39. 46
  40. 36

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