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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 998 · 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.What comes next? 1, 4, 9, 16, ? (a) 27 (b) 25 (c) 26 (d) 23
  2. 2.Half of 66 =
  3. 3.9 × 4 = 3? — what is the missing digit?
  4. 4.30 × ? = 3000
  5. 5.9 × 2 = ?8 — what is the missing digit?
  6. 6.9 × 6 = 5? — what is the missing digit?
  7. 7.Magic square (every row, column and diagonal has the same total): 9 2 7 | 4 6 8 | 5 ? 3. What is the missing number?
  8. 8.10 × 9 =
  9. 9.1 + 2 + 3 + … + 88 =
  10. 10.Magic square (every row, column and diagonal has the same total): 10 20 6 | 8 12 ? | 18 4 14. What is the missing number?
  11. 11.3 × 9 =
  12. 12.If today is Friday, what day was it 31 days ago? (a) Monday (b) Wednesday (c) Friday (d) Tuesday
  13. 13.9 × 10 = 9? — what is the missing digit?
  14. 14.The 1st of a month is a Monday. What day is the 11th of the same month? (a) Friday (b) Sunday (c) Thursday (d) Wednesday
  15. 15.1 + 2 + 3 + … + 38 =
  16. 16.A father is 35 years old and his son is 12. How old was the father when the son was born?
  17. 17.What comes next? 16, 25, 36, 49, ? (a) 65 (b) 62 (c) 64 (d) 66
  18. 18.Magic square (every row, column and diagonal has the same total): 19 9 23 | 21 ? 13 | 11 25 15. What is the missing number?
  19. 19.37 × 1000 =
  20. 20.56 × 4 =
  21. 21.9 × 3 = 2? — what is the missing digit?
  22. 22.9 × 6 =
  23. 23.9 × 6 = ?4 — what is the missing digit?
  24. 24.If today is Tuesday, what day was it 35 days ago? (a) Monday (b) Friday (c) Wednesday (d) Tuesday
  25. 25.If today is Wednesday, what day will it be after 53 days? (a) Wednesday (b) Saturday (c) Sunday (d) Monday
  26. 26.169 × ? = 1690
  27. 27.40 × 4 =
  28. 28.9 × 5 =
  29. 29.38 × 1000 =
  30. 30.396 + 693 =
  31. 31.9 × 2 =
  32. 32.954 × 10 =
  33. 33.Take 99 and take away the sum of its digits. What do you get?
  34. 34.Odd one out: which number is NOT in the 6 times table? (a) 36 (b) 18 (c) 54 (d) 17
  35. 35.9 × 8 =
  36. 36.If today is Sunday, what day was it 49 days ago? (a) Monday (b) Wednesday (c) Sunday (d) Saturday
  37. 37.98 × 100 =
  38. 38.What comes next? 9, 17, 25, 33, ? (a) 49 (b) 33 (c) 41 (d) 42
  39. 39.12 × 4 =
  40. 40.Double 81 =

Answer key

  1. 25
  2. 33
  3. 6
  4. 100
  5. 1
  6. 4
  7. 10
  8. 90
  9. 3916
  10. 16
  11. 27
  12. Tuesday
  13. 0
  14. Thursday
  15. 741
  16. 23
  17. 64
  18. 17
  19. 37000
  20. 224
  21. 7
  22. 54
  23. 5
  24. Tuesday
  25. Sunday
  26. 10
  27. 160
  28. 45
  29. 38000
  30. 1089
  31. 18
  32. 9540
  33. 81
  34. 17
  35. 72
  36. Sunday
  37. 9800
  38. 41
  39. 48
  40. 162

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