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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 383 · 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): 32 ? 20 | 11 23 35 | 26 29 14. What is the missing number?
  2. 2.What comes next? 5, 10, 20, 40, ? (a) 81 (b) 60 (c) 80 (d) 70
  3. 3.9 × 3 =
  4. 4.2 × 9 =
  5. 5.59 × 4 =
  6. 6.Think of 14. Multiply it by 2, then add 6. What number do you end with?
  7. 7.Magic square (every row, column and diagonal has the same total): 11 16 15 | 18 14 10 | ? 12 17. What is the missing number?
  8. 8.37 × 24 =
  9. 9.1 × 9 =
  10. 10.Half of 82 =
  11. 11.9 × 2 =
  12. 12.Do the 1089 trick with 125: reverse and subtract, then reverse that answer and add. What do you get?
  13. 13.Magic square (every row, column and diagonal has the same total): 2 ? 4 | 7 5 3 | 6 1 8. What is the missing number?
  14. 14.30 × ? = 3000
  15. 15.If today is Tuesday, what day was it 50 days ago? (a) Sunday (b) Tuesday (c) Monday (d) Thursday
  16. 16.9 × 8 =
  17. 17.9 × 5 = ?5 — what is the missing digit?
  18. 18.28 × 4 =
  19. 19.Take 48 and take away the sum of its digits. What do you get?
  20. 20.1 + 3 + 5 + … + 11 =
  21. 21.396 + 693 =
  22. 22.11 × 11 =
  23. 23.Think of 5. Multiply it by 3, then add 1. What number do you end with?
  24. 24.Think of 11. Multiply it by 2, then add 8. What number do you end with?
  25. 25.1 + 3 + 5 + … + 41 =
  26. 26.40 × 4 =
  27. 27.37 × 21 =
  28. 28.If today is Thursday, what day will it be after 43 days? (a) Saturday (b) Thursday (c) Friday (d) Monday
  29. 29.3 × 9 =
  30. 30.Double 65 =
  31. 31.What comes next? 1, 4, 9, 16, ? (a) 26 (b) 27 (c) 23 (d) 25
  32. 32.Half of 98 =
  33. 33.Double 24 =
  34. 34.10 × 4 =
  35. 35.27 × 4 =
  36. 36.9 × 6 =
  37. 37.1 + 2 + 3 + … + 44 =
  38. 38.693 + 396 =
  39. 39.6 × 4 =
  40. 40.What comes next? 6, 10, 14, 18, ? (a) 23 (b) 18 (c) 26 (d) 22

Answer key

  1. 17
  2. 80
  3. 27
  4. 18
  5. 236
  6. 34
  7. 13
  8. 888
  9. 9
  10. 41
  11. 18
  12. 1089
  13. 9
  14. 100
  15. Monday
  16. 72
  17. 4
  18. 112
  19. 36
  20. 36
  21. 1089
  22. 121
  23. 16
  24. 30
  25. 441
  26. 160
  27. 777
  28. Friday
  29. 27
  30. 130
  31. 25
  32. 49
  33. 48
  34. 40
  35. 108
  36. 54
  37. 990
  38. 1089
  39. 24
  40. 22

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