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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 102 · 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.Magic square (every row, column and diagonal has the same total): 15 36 21 | ? 24 18 | 27 12 33. What is the missing number?
  2. 2.882 × 10 =
  3. 3.Half of 32 =
  4. 4.8 × 100 =
  5. 5.Double 15 =
  6. 6.1 + 2 + 3 + … + 70 =
  7. 7.What comes next? 2, 4, 8, 16, ? (a) 24 (b) 33 (c) 32 (d) 28
  8. 8.Half of 38 =
  9. 9.Odd one out: which number is NOT in the 3 times table? (a) 6 (b) 12 (c) 9 (d) 7
  10. 10.1 + 2 + 3 + … + 35 =
  11. 11.7 × 9 =
  12. 12.7 × 1000 =
  13. 13.I thought of a number, added 7 and then doubled it. I got 20. What was my number?
  14. 14.The 8th of a month is a Saturday. What day is the 27th of the same month? (a) Sunday (b) Friday (c) Wednesday (d) Thursday
  15. 15.9 × 8 = 7? — what is the missing digit?
  16. 16.9 × 3 = ?7 — what is the missing digit?
  17. 17.502 × 10 =
  18. 18.Take 38 and take away the sum of its digits. What do you get?
  19. 19.Take 25 and take away the sum of its digits. What do you get?
  20. 20.The 6th of a month is a Wednesday. What day is the 27th of the same month? (a) Thursday (b) Tuesday (c) Saturday (d) Wednesday
  21. 21.The 1st of a month is a Monday. What day is the 21st of the same month? (a) Wednesday (b) Saturday (c) Monday (d) Sunday
  22. 22.29 × 4 =
  23. 23.If today is Wednesday, what day was it 35 days ago? (a) Wednesday (b) Thursday (c) Saturday (d) Tuesday
  24. 24.12345 × 9 + 6 =
  25. 25.A girl is 6 years old and her brother is 3 years older. How old will her brother be in 6 years?
  26. 26.9 × 2 = 1? — what is the missing digit?
  27. 27.Take 65 and take away the sum of its digits. What do you get?
  28. 28.45 × 4 =
  29. 29.21 × 1000 =
  30. 30.If today is Tuesday, what day was it 31 days ago? (a) Saturday (b) Tuesday (c) Friday (d) Sunday
  31. 31.What comes next? 13, 21, 29, 37, ? (a) 37 (b) 45 (c) 46 (d) 53
  32. 32.9 × 9 = ?1 — what is the missing digit?
  33. 33.1 + 3 + 5 + … + 15 =
  34. 34.1 + 3 + 5 + … + 17 =
  35. 35.9 × 4 =
  36. 36.What comes next? 16, 25, 36, 49, ? (a) 66 (b) 65 (c) 62 (d) 64
  37. 37.What comes next? 9, 16, 25, 36, ? (a) 51 (b) 49 (c) 50 (d) 47
  38. 38.123456 × 9 + 7 =
  39. 39.A father is 31 years old and his son is 9. How old was the father when the son was born?
  40. 40.What comes next? 3, 6, 12, 24, ? (a) 49 (b) 48 (c) 36 (d) 42

Answer key

  1. 30
  2. 8820
  3. 16
  4. 800
  5. 30
  6. 2485
  7. 32
  8. 19
  9. 7
  10. 630
  11. 63
  12. 7000
  13. 3
  14. Thursday
  15. 2
  16. 2
  17. 5020
  18. 27
  19. 18
  20. Wednesday
  21. Sunday
  22. 116
  23. Wednesday
  24. 111111
  25. 15
  26. 8
  27. 54
  28. 180
  29. 21000
  30. Saturday
  31. 45
  32. 8
  33. 64
  34. 81
  35. 36
  36. 64
  37. 49
  38. 1111111
  39. 22
  40. 48

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