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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 717 · 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. 1.9 × 10 = 9? — what is the missing digit?
  2. 2.1234567 × 9 + 8 =
  3. 3.943 × ? = 9430
  4. 4.22 × 4 =
  5. 5.1 + 2 + 3 + … + 8 =
  6. 6.1 + 3 + 5 + … + 19 =
  7. 7.Do the 1089 trick with 579: reverse and subtract, then reverse that answer and add. What do you get?
  8. 8.9 × 7 = ?3 — what is the missing digit?
  9. 9.Magic square (every row, column and diagonal has the same total): 6 27 12 | ? 15 9 | 18 3 24. What is the missing number?
  10. 10.9 × 7 = 6? — what is the missing digit?
  11. 11.A girl is 5 years old and her brother is 5 years older. How old will her brother be in 2 years?
  12. 12.Odd one out: which number is NOT in the 9 times table? (a) 36 (b) 63 (c) 72 (d) 40
  13. 13.9 × 4 = 3? — what is the missing digit?
  14. 14.A girl is 7 years old and her brother is 6 years older. How old will her brother be in 5 years?
  15. 15.9 × 9 = ?1 — what is the missing digit?
  16. 16.1 + 2 + 3 + … + 40 =
  17. 17.If today is Friday, what day will it be after 49 days? (a) Friday (b) Thursday (c) Saturday (d) Monday
  18. 18.31 × 4 =
  19. 19.9 × 1 =
  20. 20.9 × 5 =
  21. 21.2 × 9 =
  22. 22.If today is Monday, what day will it be after 63 days? (a) Monday (b) Sunday (c) Tuesday (d) Thursday
  23. 23.15 × 4 =
  24. 24.9 × 3 = 2? — what is the missing digit?
  25. 25.What comes next? 9, 16, 25, 36, ? (a) 47 (b) 51 (c) 50 (d) 49
  26. 26.The ages of two twins add up to 26. How old is each twin?
  27. 27.What comes next? 16, 25, 36, 49, ? (a) 65 (b) 62 (c) 64 (d) 66
  28. 28.A father is 41 years old and his son is 11. How old was the father when the son was born?
  29. 29.1 + 3 + 5 + … + 15 =
  30. 30.Half of 192 =
  31. 31.1 + 2 + 3 + … + 60 =
  32. 32.In 2 years a boy will be 10 years old. How old was he 6 years ago?
  33. 33.59 × 4 =
  34. 34.123456789 × 8 + 9 =
  35. 35.What comes next? 10, 13, 16, 19, ? (a) 25 (b) 22 (c) 19 (d) 23
  36. 36.Double 35 =
  37. 37.The 4th of a month is a Sunday. What day is the 27th of the same month? (a) Friday (b) Wednesday (c) Tuesday (d) Monday
  38. 38.Odd one out: which number is NOT in the 7 times table? (a) 14 (b) 49 (c) 39 (d) 28
  39. 39.The ages of two twins add up to 8. How old is each twin?
  40. 40.What comes next? 5, 10, 20, 40, ? (a) 60 (b) 70 (c) 81 (d) 80

Answer key

  1. 0
  2. 11111111
  3. 10
  4. 88
  5. 36
  6. 100
  7. 1089
  8. 6
  9. 21
  10. 3
  11. 12
  12. 40
  13. 6
  14. 18
  15. 8
  16. 820
  17. Friday
  18. 124
  19. 9
  20. 45
  21. 18
  22. Monday
  23. 60
  24. 7
  25. 49
  26. 13
  27. 64
  28. 30
  29. 64
  30. 96
  31. 1830
  32. 2
  33. 236
  34. 987654321
  35. 22
  36. 70
  37. Tuesday
  38. 39
  39. 4
  40. 80

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