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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 800 · 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. 1.37 × 6 =
  2. 2.What comes next? 36, 49, 64, 81, ? (a) 100 (b) 98 (c) 101 (d) 102
  3. 3.1 + 2 + 3 + … + 51 =
  4. 4.I thought of a number, multiplied it by 5 and added 2. I got 37. What was my number?
  5. 5.If today is Wednesday, what day will it be after 61 days? (a) Sunday (b) Monday (c) Tuesday (d) Thursday
  6. 6.Double 79 =
  7. 7.7 × 9 =
  8. 8.Take 36 and take away the sum of its digits. What do you get?
  9. 9.A father is 44 years old and his son is 7. How old was the father when the son was born?
  10. 10.10 × 9 =
  11. 11.Double 32 =
  12. 12.9 × 6 = ?4 — what is the missing digit?
  13. 13.Odd one out: which number is NOT in the 3 times table? (a) 17 (b) 27 (c) 12 (d) 21
  14. 14.9 × 3 = ?7 — what is the missing digit?
  15. 15.?451 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.What comes next? 4, 8, 16, 32, ? (a) 48 (b) 65 (c) 56 (d) 64
  17. 17.792 + 297 =
  18. 18.Double 13 =
  19. 19.15 × 4 =
  20. 20.Double 77 =
  21. 21.123456 × 8 + 6 =
  22. 22.9 × 9 =
  23. 23.453 × 10 =
  24. 24.If today is Monday, what day will it be after 73 days? (a) Thursday (b) Friday (c) Sunday (d) Wednesday
  25. 25.9 × 9 = ?1 — what is the missing digit?
  26. 26.12345678 × 8 + 8 =
  27. 27.12345679 × 18 =
  28. 28.1 × 9 =
  29. 29.Magic square (every row, column and diagonal has the same total): 12 27 6 | 9 ? 21 | 24 3 18. What is the missing number?
  30. 30.9 × 2 =
  31. 31.Magic square (every row, column and diagonal has the same total): 11 32 17 | 26 20 ? | 23 8 29. What is the missing number?
  32. 32.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
  33. 33.What comes next? 17, 23, 29, 35, ? (a) 35 (b) 47 (c) 41 (d) 42
  34. 34.388 × 10 =
  35. 35.44 × 100 =
  36. 36.The 5th of a month is a Friday. What day is the 16th of the same month? (a) Monday (b) Tuesday (c) Friday (d) Wednesday
  37. 37.What comes next? 1, 4, 9, 16, ? (a) 27 (b) 23 (c) 26 (d) 25
  38. 38.47 × 4 =
  39. 39.2 × 9 =
  40. 40.20?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

  1. 222
  2. 100
  3. 1326
  4. 7
  5. Monday
  6. 158
  7. 63
  8. 27
  9. 37
  10. 90
  11. 64
  12. 5
  13. 17
  14. 2
  15. 8
  16. 64
  17. 1089
  18. 26
  19. 60
  20. 154
  21. 987654
  22. 81
  23. 4530
  24. Thursday
  25. 8
  26. 98765432
  27. 222222222
  28. 9
  29. 15
  30. 18
  31. 14
  32. 891
  33. 41
  34. 3880
  35. 4400
  36. Tuesday
  37. 25
  38. 188
  39. 18
  40. 5

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