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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 130 · 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.?218 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.9 × 4 = ?6 — what is the missing digit?
  3. 3.?013 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.626 × 10 =
  5. 5.I thought of a number, added 1 and then doubled it. I got 28. What was my number?
  6. 6.The 5th of a month is a Tuesday. What day is the 20th of the same month? (a) Tuesday (b) Wednesday (c) Thursday (d) Saturday
  7. 7.What comes next? 4, 13, 22, 31, ? (a) 40 (b) 49 (c) 31 (d) 41
  8. 8.What comes next? 16, 25, 36, 49, ? (a) 66 (b) 65 (c) 64 (d) 62
  9. 9.60?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.10 × 9 =
  11. 11.In 4 years a boy will be 16 years old. How old was he 7 years ago?
  12. 12.453 × ? = 4530
  13. 13.Do the 1089 trick with 734: reverse and subtract, then reverse that answer and add. What do you get?
  14. 14.579? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.The 9th of a month is a Saturday. What day is the 17th of the same month? (a) Monday (b) Sunday (c) Wednesday (d) Saturday
  16. 16.12345 × 9 + 6 =
  17. 17.Half of 86 =
  18. 18.7 × 4 =
  19. 19.A piggy bank has 10 coins of ₹5 and 9 coins of ₹2. How many rupees are in it?
  20. 20.498 × 10 =
  21. 21.1 + 2 + 3 + … + 79 =
  22. 22.9 × 3 = ?7 — what is the missing digit?
  23. 23.518 × 10 =
  24. 24.Think of 15. Multiply it by 4, then add 2. What number do you end with?
  25. 25.9 × 10 =
  26. 26.Double 63 =
  27. 27.What comes next? 2, 4, 8, 16, ? (a) 33 (b) 24 (c) 32 (d) 28
  28. 28.If today is Friday, what day was it 27 days ago? (a) Tuesday (b) Friday (c) Sunday (d) Saturday
  29. 29.Double 61 =
  30. 30.Magic square (every row, column and diagonal has the same total): 4 9 2 | 3 5 7 | 8 1 ?. What is the missing number?
  31. 31.Do the 1089 trick with 128: reverse and subtract, then reverse that answer and add. What do you get?
  32. 32.7 × 9 =
  33. 33.9 × 4 = 3? — what is the missing digit?
  34. 34.Half of 122 =
  35. 35.What comes next? 1, 2, 4, 8, ? (a) 17 (b) 14 (c) 16 (d) 12
  36. 36.Magic square (every row, column and diagonal has the same total): ? 17 10 | 11 13 15 | 16 9 14. What is the missing number?
  37. 37.4 × 9 =
  38. 38.9 × 3 = 2? — what is the missing digit?
  39. 39.I thought of a number, multiplied it by 5 and added 1. I got 21. What was my number?
  40. 40.1 + 2 + 3 + … + 60 =

Answer key

  1. 7
  2. 3
  3. 5
  4. 6260
  5. 13
  6. Wednesday
  7. 40
  8. 64
  9. 8
  10. 90
  11. 5
  12. 10
  13. 1089
  14. 6
  15. Sunday
  16. 111111
  17. 43
  18. 28
  19. 68
  20. 4980
  21. 3160
  22. 2
  23. 5180
  24. 62
  25. 90
  26. 126
  27. 32
  28. Saturday
  29. 122
  30. 6
  31. 1089
  32. 63
  33. 6
  34. 61
  35. 16
  36. 12
  37. 36
  38. 7
  39. 4
  40. 1830

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