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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 974 · 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, 2, 4, 8, ? (a) 16 (b) 14 (c) 17 (d) 12
  2. 2.1 + 2 + 3 + … + 39 =
  3. 3.Odd one out: which number is NOT in the 6 times table? (a) 18 (b) 36 (c) 47 (d) 54
  4. 4.38 × 4 =
  5. 5.3 × 9 =
  6. 6.9 × 6 = ?4 — what is the missing digit?
  7. 7.9 × 9 = ?1 — what is the missing digit?
  8. 8.Take 24 and take away the sum of its digits. What do you get?
  9. 9.What comes next? 5, 10, 20, 40, ? (a) 60 (b) 70 (c) 80 (d) 81
  10. 10.80?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.In 6 years a boy will be 18 years old. How old was he 2 years ago?
  12. 12.111111 × 111111 =
  13. 13.2?33 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.5 × 9 =
  15. 15.11 × 4 =
  16. 16.9 × 7 = 6? — what is the missing digit?
  17. 17.Double 82 =
  18. 18.Magic square (every row, column and diagonal has the same total): 13 15 5 | 3 11 ? | 17 7 9. What is the missing number?
  19. 19.10 × 9 =
  20. 20.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
  21. 21.Do the 1089 trick with 154: reverse and subtract, then reverse that answer and add. What do you get?
  22. 22.Double 57 =
  23. 23.9 × 8 =
  24. 24.12345679 × 54 =
  25. 25.9 × 6 =
  26. 26.123 × 8 + 3 =
  27. 27.5?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.34 × 4 =
  29. 29.12 × 4 =
  30. 30.131 × ? = 1310
  31. 31.What comes next? 18, 25, 32, 39, ? (a) 53 (b) 39 (c) 47 (d) 46
  32. 32.8 × 9 =
  33. 33.If today is Wednesday, what day will it be after 29 days? (a) Sunday (b) Wednesday (c) Friday (d) Thursday
  34. 34.9 × 3 =
  35. 35.I thought of a number, added 3 and then doubled it. I got 42. What was my number?
  36. 36.Half of 22 =
  37. 37.9 × 7 =
  38. 38.A father is 32 years old and his son is 10. How old was the father when the son was born?
  39. 39.Take 237. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  40. 40.Magic square (every row, column and diagonal has the same total): 9 2 7 | 4 6 8 | 5 ? 3. What is the missing number?

Answer key

  1. 16
  2. 780
  3. 47
  4. 152
  5. 27
  6. 5
  7. 8
  8. 18
  9. 80
  10. 3
  11. 10
  12. 12345654321
  13. 1
  14. 45
  15. 44
  16. 3
  17. 164
  18. 19
  19. 90
  20. 693
  21. 1089
  22. 114
  23. 72
  24. 666666666
  25. 54
  26. 987
  27. 2
  28. 136
  29. 48
  30. 10
  31. 46
  32. 72
  33. Thursday
  34. 27
  35. 18
  36. 11
  37. 63
  38. 22
  39. 495
  40. 10

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