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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 789 · 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. 1.23 × 4 =
  2. 2.Magic square (every row, column and diagonal has the same total): 18 ? 24 | 21 15 9 | 6 27 12. What is the missing number?
  3. 3.Take 950. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  4. 4.1 + 3 + 5 + … + 37 =
  5. 5.13 × 1000 =
  6. 6.785? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.The ages of two twins add up to 28. How old is each twin?
  8. 8.What comes next? 16, 24, 32, 40, ? (a) 56 (b) 48 (c) 40 (d) 49
  9. 9.9 × 7 = ?3 — what is the missing digit?
  10. 10.297 + 792 =
  11. 11.What comes next? 4, 12, 20, 28, ? (a) 36 (b) 37 (c) 28 (d) 44
  12. 12.If today is Friday, what day will it be after 26 days? (a) Tuesday (b) Saturday (c) Thursday (d) Wednesday
  13. 13.Double 66 =
  14. 14.1 × 9 =
  15. 15.9 × 3 = ?7 — what is the missing digit?
  16. 16.Half of 192 =
  17. 17.9 × 8 = ?2 — what is the missing digit?
  18. 18.9 × 9 = ?1 — what is the missing digit?
  19. 19.9 × 9 =
  20. 20.1 + 2 + 3 + … + 56 =
  21. 21.9 × 10 =
  22. 22.Think of 8. Multiply it by 2, then add 6. What number do you end with?
  23. 23.Magic square (every row, column and diagonal has the same total): 15 25 11 | 13 17 21 | 23 9 ?. What is the missing number?
  24. 24.1 + 3 + 5 + … + 49 =
  25. 25.Magic square (every row, column and diagonal has the same total): 25 ? 13 | 10 22 34 | 31 16 19. What is the missing number?
  26. 26.What comes next? 13, 20, 27, 34, ? (a) 42 (b) 48 (c) 41 (d) 34
  27. 27.9 × 2 = ?8 — what is the missing digit?
  28. 28.123 × 8 + 3 =
  29. 29.In 4 years a boy will be 12 years old. How old was he 3 years ago?
  30. 30.6 × 4 =
  31. 31.Magic square (every row, column and diagonal has the same total): 28 7 ? | 13 19 25 | 16 31 10. What is the missing number?
  32. 32.18 × 4 =
  33. 33.In the 1089 trick, the subtraction gave a 3-digit number that starts with 7. What is that number?
  34. 34.What comes next? 36, 49, 64, 81, ? (a) 100 (b) 102 (c) 101 (d) 98
  35. 35.35 × 1000 =
  36. 36.If today is Wednesday, what day will it be after 56 days? (a) Wednesday (b) Tuesday (c) Saturday (d) Thursday
  37. 37.I thought of a number, added 6 and then doubled it. I got 46. What was my number?
  38. 38.73?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.123456 × 8 + 6 =
  40. 40.Magic square (every row, column and diagonal has the same total): ? 8 29 | 26 20 14 | 11 32 17. What is the missing number?

Answer key

  1. 92
  2. 3
  3. 891
  4. 361
  5. 13000
  6. 7
  7. 14
  8. 48
  9. 6
  10. 1089
  11. 36
  12. Wednesday
  13. 132
  14. 9
  15. 2
  16. 96
  17. 7
  18. 8
  19. 81
  20. 1596
  21. 90
  22. 22
  23. 19
  24. 625
  25. 28
  26. 41
  27. 1
  28. 987
  29. 5
  30. 24
  31. 22
  32. 72
  33. 792
  34. 100
  35. 35000
  36. Wednesday
  37. 17
  38. 2
  39. 987654
  40. 23

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