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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 791 · 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.I thought of a number, multiplied it by 2 and added 6. I got 14. What was my number?
  2. 2.The 3rd of a month is a Friday. What day is the 16th of the same month? (a) Sunday (b) Friday (c) Thursday (d) Wednesday
  3. 3.9 × 6 = ?4 — what is the missing digit?
  4. 4.The 8th of a month is a Friday. What day is the 20th of the same month? (a) Saturday (b) Tuesday (c) Wednesday (d) Thursday
  5. 5.22 × 4 =
  6. 6.9 × 7 = 6? — what is the missing digit?
  7. 7.1 + 3 + 5 + … + 11 =
  8. 8.1 + 3 + 5 + … + 39 =
  9. 9.9 × 3 =
  10. 10.9 × 9 =
  11. 11.12345678 × 8 + 8 =
  12. 12.12 × 9 + 3 =
  13. 13.Magic square (every row, column and diagonal has the same total): 26 29 14 | 11 ? 35 | 32 17 20. What is the missing number?
  14. 14.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
  15. 15.Magic square (every row, column and diagonal has the same total): 33 12 27 | ? 24 30 | 21 36 15. What is the missing number?
  16. 16.1 + 3 + 5 + … + 19 =
  17. 17.2 × 9 =
  18. 18.What comes next? 16, 25, 36, 49, ? (a) 62 (b) 65 (c) 66 (d) 64
  19. 19.1 + 3 + 5 + … + 9 =
  20. 20.Magic square (every row, column and diagonal has the same total): 15 ? 11 | 8 12 16 | 13 14 9. What is the missing number?
  21. 21.Think of 12. Multiply it by 2, then add 6. What number do you end with?
  22. 22.What comes next? 19, 21, 23, 25, ? (a) 28 (b) 29 (c) 25 (d) 27
  23. 23.Take 56 and take away the sum of its digits. What do you get?
  24. 24.30 × 4 =
  25. 25.I thought of a number, added 6 and then doubled it. I got 52. What was my number?
  26. 26.9 × 10 = 9? — what is the missing digit?
  27. 27.12345679 × 27 =
  28. 28.Magic square (every row, column and diagonal has the same total): 12 10 20 | 22 14 6 | 8 ? 16. What is the missing number?
  29. 29.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
  30. 30.I thought of a number, multiplied it by 4 and added 3. I got 47. What was my number?
  31. 31.9 × 8 =
  32. 32.Double 78 =
  33. 33.1 + 3 + 5 + … + 47 =
  34. 34.Half of 192 =
  35. 35.Double 35 =
  36. 36.Odd one out: which number is NOT in the 4 times table? (a) 9 (b) 28 (c) 20 (d) 12
  37. 37.9 × 3 = ?7 — what is the missing digit?
  38. 38.Half of 198 =
  39. 39.12345 × 9 + 6 =
  40. 40.68 × 100 =

Answer key

  1. 4
  2. Thursday
  3. 5
  4. Wednesday
  5. 88
  6. 3
  7. 36
  8. 400
  9. 27
  10. 81
  11. 98765432
  12. 111
  13. 23
  14. 495
  15. 18
  16. 100
  17. 18
  18. 64
  19. 25
  20. 10
  21. 30
  22. 27
  23. 45
  24. 120
  25. 20
  26. 0
  27. 333333333
  28. 18
  29. 693
  30. 11
  31. 72
  32. 156
  33. 576
  34. 96
  35. 70
  36. 9
  37. 2
  38. 99
  39. 111111
  40. 6800

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