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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 688 · 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. 1.9 × 5 = 4? — what is the missing digit?
  2. 2.3 × 9 =
  3. 3.I thought of a number, added 1 and then doubled it. I got 22. What was my number?
  4. 4.Double 59 =
  5. 5.Magic square (every row, column and diagonal has the same total): 20 23 ? | 5 17 29 | 26 11 14. What is the missing number?
  6. 6.12345679 × 81 =
  7. 7.9 × 4 =
  8. 8.11111 × 11111 =
  9. 9.Magic square (every row, column and diagonal has the same total): 16 31 ? | 13 19 25 | 28 7 22. What is the missing number?
  10. 10.Magic square (every row, column and diagonal has the same total): 13 ? 25 | 28 16 4 | 7 22 19. What is the missing number?
  11. 11.4 × 9 =
  12. 12.Odd one out: which number is NOT in the 8 times table? (a) 24 (b) 48 (c) 56 (d) 79
  13. 13.10 × 4 =
  14. 14.1 + 2 + 3 + … + 42 =
  15. 15.1 + 3 + 5 + … + 21 =
  16. 16.1 × 9 =
  17. 17.1 + 3 + 5 + … + 11 =
  18. 18.9 × 6 = 5? — what is the missing digit?
  19. 19.Half of 26 =
  20. 20.28 × 4 =
  21. 21.In 2 years a boy will be 14 years old. How old was he 4 years ago?
  22. 22.Odd one out: which number is NOT in the 3 times table? (a) 6 (b) 18 (c) 19 (d) 12
  23. 23.9 × 5 =
  24. 24.Magic square (every row, column and diagonal has the same total): 9 19 5 | 7 ? 15 | 17 3 13. What is the missing number?
  25. 25.What comes next? 2, 4, 8, 16, ? (a) 32 (b) 33 (c) 28 (d) 24
  26. 26.If today is Wednesday, what day will it be after 28 days? (a) Thursday (b) Saturday (c) Wednesday (d) Tuesday
  27. 27.12345 × 9 + 6 =
  28. 28.Half of 98 =
  29. 29.9 × 9 = 8? — what is the missing digit?
  30. 30.19 × 4 =
  31. 31.Half of 52 =
  32. 32.12345679 × 54 =
  33. 33.Double 19 =
  34. 34.Magic square (every row, column and diagonal has the same total): 8 3 4 | ? 5 9 | 6 7 2. What is the missing number?
  35. 35.9 × 3 = ?7 — what is the missing digit?
  36. 36.45 × 4 =
  37. 37.Double 96 =
  38. 38.52 × 10 =
  39. 39.9 × 10 = ?0 — what is the missing digit?
  40. 40.1 + 2 + 3 + … + 73 =

Answer key

  1. 5
  2. 27
  3. 10
  4. 118
  5. 8
  6. 999999999
  7. 36
  8. 123454321
  9. 10
  10. 10
  11. 36
  12. 79
  13. 40
  14. 903
  15. 121
  16. 9
  17. 36
  18. 4
  19. 13
  20. 112
  21. 8
  22. 19
  23. 45
  24. 11
  25. 32
  26. Wednesday
  27. 111111
  28. 49
  29. 1
  30. 76
  31. 26
  32. 666666666
  33. 38
  34. 1
  35. 2
  36. 180
  37. 192
  38. 520
  39. 9
  40. 2701

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