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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 590 · 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 + … + 54 =
  2. 2.1 + 2 + 3 + … + 16 =
  3. 3.9 × 4 = ?6 — what is the missing digit?
  4. 4.What comes next? 2, 4, 8, 16, ? (a) 24 (b) 28 (c) 33 (d) 32
  5. 5.214 × ? = 2140
  6. 6.Magic square (every row, column and diagonal has the same total): ? 14 9 | 8 12 16 | 15 10 11. What is the missing number?
  7. 7.706 × 10 =
  8. 8.581 × ? = 5810
  9. 9.Half of 26 =
  10. 10.In 2 years a boy will be 10 years old. How old was he 5 years ago?
  11. 11.9 × 8 = 7? — what is the missing digit?
  12. 12.In 2 years a boy will be 10 years old. How old was he 3 years ago?
  13. 13.19 × 100 =
  14. 14.1 + 2 + 3 + … + 50 =
  15. 15.37 × 12 =
  16. 16.Take 533. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  17. 17.Magic square (every row, column and diagonal has the same total): 6 11 4 | ? 7 9 | 10 3 8. What is the missing number?
  18. 18.What comes next? 25, 36, 49, 64, ? (a) 81 (b) 79 (c) 82 (d) 83
  19. 19.297 + 792 =
  20. 20.26 × 4 =
  21. 21.What comes next? 5, 10, 20, 40, ? (a) 70 (b) 80 (c) 81 (d) 60
  22. 22.1 + 2 + 3 + … + 43 =
  23. 23.1 + 2 + 3 + … + 97 =
  24. 24.111 × 111 =
  25. 25.Take 82 and take away the sum of its digits. What do you get?
  26. 26.9 × 3 = ?7 — what is the missing digit?
  27. 27.37 × 21 =
  28. 28.1 + 2 + 3 + … + 52 =
  29. 29.9 × 4 = 3? — what is the missing digit?
  30. 30.3 × 9 =
  31. 31.The 6th of a month is a Monday. What day is the 22nd of the same month? (a) Wednesday (b) Saturday (c) Thursday (d) Tuesday
  32. 32.Magic square (every row, column and diagonal has the same total): 9 14 7 | 8 10 ? | 13 6 11. What is the missing number?
  33. 33.If today is Thursday, what day was it 39 days ago? (a) Monday (b) Wednesday (c) Sunday (d) Saturday
  34. 34.18 × 4 =
  35. 35.54 × 4 =
  36. 36.9 × 3 =
  37. 37.45 × ? = 45000
  38. 38.1 + 2 + 3 + … + 38 =
  39. 39.Magic trick! Think of 10. Double it, add 18, halve it, then take away 10. What number do you get?
  40. 40.9 × 9 = ?1 — what is the missing digit?

Answer key

  1. 1485
  2. 136
  3. 3
  4. 32
  5. 10
  6. 13
  7. 7060
  8. 10
  9. 13
  10. 3
  11. 2
  12. 5
  13. 1900
  14. 1275
  15. 444
  16. 198
  17. 5
  18. 81
  19. 1089
  20. 104
  21. 80
  22. 946
  23. 4753
  24. 12321
  25. 72
  26. 2
  27. 777
  28. 1378
  29. 6
  30. 27
  31. Wednesday
  32. 12
  33. Sunday
  34. 72
  35. 216
  36. 27
  37. 1000
  38. 741
  39. 9
  40. 8

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