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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 709 · 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 × 6 = 5? — what is the missing digit?
  2. 2.9 × 10 =
  3. 3.55 × 100 =
  4. 4.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
  5. 5.9 × 3 =
  6. 6.Magic square (every row, column and diagonal has the same total): ? 11 6 | 9 7 5 | 8 3 10. What is the missing number?
  7. 7.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
  8. 8.1 + 3 + 5 + … + 35 =
  9. 9.What comes next? 36, 49, 64, 81, ? (a) 100 (b) 102 (c) 101 (d) 98
  10. 10.16 × 4 =
  11. 11.In the 1089 trick, the subtraction gave a 3-digit number that starts with 7. What is that number?
  12. 12.Half of 136 =
  13. 13.7 × 4 =
  14. 14.10 × 4 =
  15. 15.36 × 10 =
  16. 16.1 + 3 + 5 + … + 45 =
  17. 17.Double 37 =
  18. 18.12 × 9 + 3 =
  19. 19.A father is 31 years old and his son is 5. How old was the father when the son was born?
  20. 20.What comes next? 12, 15, 18, 21, ? (a) 27 (b) 21 (c) 24 (d) 25
  21. 21.6 × 9 =
  22. 22.The 9th of a month is a Sunday. What day is the 21st of the same month? (a) Friday (b) Thursday (c) Saturday (d) Monday
  23. 23.1234 × 8 + 4 =
  24. 24.14 × 100 =
  25. 25.Half of 122 =
  26. 26.10 × 9 =
  27. 27.Half of 26 =
  28. 28.9 × 8 = ?2 — what is the missing digit?
  29. 29.Double 23 =
  30. 30.24 × 4 =
  31. 31.123456 × 8 + 6 =
  32. 32.297 + 792 =
  33. 33.Take 55 and take away the sum of its digits. What do you get?
  34. 34.14 × 4 =
  35. 35.Magic square (every row, column and diagonal has the same total): 15 30 9 | 12 18 ? | 27 6 21. What is the missing number?
  36. 36.1 + 2 + 3 + … + 21 =
  37. 37.37 × 15 =
  38. 38.Magic square (every row, column and diagonal has the same total): 14 9 10 | 7 ? 15 | 12 13 8. What is the missing number?
  39. 39.If today is Tuesday, what day was it 23 days ago? (a) Sunday (b) Saturday (c) Monday (d) Wednesday
  40. 40.The 9th of a month is a Thursday. What day is the 26th of the same month? (a) Sunday (b) Wednesday (c) Monday (d) Saturday

Answer key

  1. 4
  2. 90
  3. 5500
  4. 891
  5. 27
  6. 4
  7. 396
  8. 324
  9. 100
  10. 64
  11. 792
  12. 68
  13. 28
  14. 40
  15. 360
  16. 529
  17. 74
  18. 111
  19. 26
  20. 24
  21. 54
  22. Friday
  23. 9876
  24. 1400
  25. 61
  26. 90
  27. 13
  28. 7
  29. 46
  30. 96
  31. 987654
  32. 1089
  33. 45
  34. 56
  35. 24
  36. 231
  37. 555
  38. 11
  39. Sunday
  40. Sunday

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