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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 414 · 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. 1.1 + 2 + 3 + … + 94 =
  2. 2.9 × 1 =
  3. 3.756 × 10 =
  4. 4.If today is Tuesday, what day will it be after 58 days? (a) Sunday (b) Thursday (c) Wednesday (d) Friday
  5. 5.37 × 4 =
  6. 6.9 × 5 =
  7. 7.If today is Sunday, what day will it be after 60 days? (a) Sunday (b) Wednesday (c) Friday (d) Thursday
  8. 8.12345679 × 54 =
  9. 9.1 + 2 + 3 + … + 60 =
  10. 10.7 × 9 =
  11. 11.13 × ? = 13000
  12. 12.2 × 9 =
  13. 13.9 × 6 =
  14. 14.4 × 9 =
  15. 15.A father is 43 years old and his son is 10. How old was the father when the son was born?
  16. 16.9 × 3 =
  17. 17.Double 55 =
  18. 18.A father is 33 years old and his son is 12. How old was the father when the son was born?
  19. 19.6 × ? = 6000
  20. 20.What comes next? 18, 22, 26, 30, ? (a) 30 (b) 38 (c) 34 (d) 35
  21. 21.A father is 33 years old and his son is 13. How old was the father when the son was born?
  22. 22.6 × 4 =
  23. 23.318? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.9 × 9 = 8? — what is the missing digit?
  25. 25.17 × 4 =
  26. 26.9 × 2 = ?8 — what is the missing digit?
  27. 27.What comes next? 4, 8, 16, 32, ? (a) 64 (b) 48 (c) 56 (d) 65
  28. 28.Double 71 =
  29. 29.111111 × 111111 =
  30. 30.If today is Tuesday, what day was it 11 days ago? (a) Saturday (b) Friday (c) Monday (d) Thursday
  31. 31.40 × ? = 4000
  32. 32.Magic square (every row, column and diagonal has the same total): 8 3 10 | 9 7 5 | 4 ? 6. What is the missing number?
  33. 33.Magic square (every row, column and diagonal has the same total): ? 4 14 | 8 12 16 | 10 20 6. What is the missing number?
  34. 34.37 × 6 =
  35. 35.What comes next? 2, 4, 8, 16, ? (a) 28 (b) 33 (c) 24 (d) 32
  36. 36.Magic square (every row, column and diagonal has the same total): 13 3 17 | ? 11 7 | 5 19 9. What is the missing number?
  37. 37.Double 65 =
  38. 38.138 × 10 =
  39. 39.11 × ? = 11000
  40. 40.589 × ? = 5890

Answer key

  1. 4465
  2. 9
  3. 7560
  4. Thursday
  5. 148
  6. 45
  7. Thursday
  8. 666666666
  9. 1830
  10. 63
  11. 1000
  12. 18
  13. 54
  14. 36
  15. 33
  16. 27
  17. 110
  18. 21
  19. 1000
  20. 34
  21. 20
  22. 24
  23. 6
  24. 1
  25. 68
  26. 1
  27. 64
  28. 142
  29. 12345654321
  30. Friday
  31. 100
  32. 11
  33. 18
  34. 222
  35. 32
  36. 15
  37. 130
  38. 1380
  39. 1000
  40. 10

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