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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 724 · 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.Odd one out: which number is NOT in the 3 times table? (a) 12 (b) 9 (c) 21 (d) 17
  2. 2.28 × 4 =
  3. 3.6 × 9 =
  4. 4.If today is Monday, what day will it be after 13 days? (a) Wednesday (b) Monday (c) Saturday (d) Sunday
  5. 5.12345678 × 8 + 8 =
  6. 6.522 × 10 =
  7. 7.You have 13 coins. Each coin is ₹1 or ₹2, and together they make ₹15. How many ₹2 coins do you have?
  8. 8.9 × 4 = ?6 — what is the missing digit?
  9. 9.?235 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.Magic square (every row, column and diagonal has the same total): 6 1 8 | 7 ? 3 | 2 9 4. What is the missing number?
  11. 11.?229 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.9 × 4 =
  13. 13.9 × 10 =
  14. 14.24 × 4 =
  15. 15.Double 71 =
  16. 16.In 5 years a boy will be 16 years old. How old was he 6 years ago?
  17. 17.8?15 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.I thought of a number, added 7 and then doubled it. I got 28. What was my number?
  19. 19.9 × 1 =
  20. 20.A father is 30 years old and his son is 9. How old was the father when the son was born?
  21. 21.9 × 10 = 9? — what is the missing digit?
  22. 22.1 + 2 + 3 + … + 40 =
  23. 23.If today is Monday, what day will it be after 24 days? (a) Sunday (b) Wednesday (c) Friday (d) Thursday
  24. 24.Do the 1089 trick with 375: reverse and subtract, then reverse that answer and add. What do you get?
  25. 25.9 × 8 = ?2 — what is the missing digit?
  26. 26.Do the 1089 trick with 650: reverse and subtract, then reverse that answer and add. What do you get?
  27. 27.If today is Sunday, what day will it be after 74 days? (a) Friday (b) Thursday (c) Wednesday (d) Sunday
  28. 28.Magic square (every row, column and diagonal has the same total): 11 21 ? | 9 13 17 | 19 5 15. What is the missing number?
  29. 29.A piggy bank has 8 coins of ₹5 and 9 coins of ₹2. How many rupees are in it?
  30. 30.29 × 4 =
  31. 31.Double 53 =
  32. 32.Odd one out: which number is NOT in the 7 times table? (a) 42 (b) 34 (c) 35 (d) 21
  33. 33.I thought of a number, added 7 and then doubled it. I got 48. What was my number?
  34. 34.9 × 2 = ?8 — what is the missing digit?
  35. 35.1 + 2 + 3 + … + 57 =
  36. 36.?271 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.Double 15 =
  38. 38.If today is Sunday, what day was it 53 days ago? (a) Tuesday (b) Saturday (c) Thursday (d) Wednesday
  39. 39.73 × 100 =
  40. 40.What comes next? 5, 10, 20, 40, ? (a) 70 (b) 60 (c) 80 (d) 81

Answer key

  1. 17
  2. 112
  3. 54
  4. Sunday
  5. 98765432
  6. 5220
  7. 2
  8. 3
  9. 8
  10. 5
  11. 5
  12. 36
  13. 90
  14. 96
  15. 142
  16. 5
  17. 4
  18. 7
  19. 9
  20. 21
  21. 0
  22. 820
  23. Thursday
  24. 1089
  25. 7
  26. 1089
  27. Thursday
  28. 7
  29. 58
  30. 116
  31. 106
  32. 34
  33. 17
  34. 1
  35. 1653
  36. 8
  37. 30
  38. Wednesday
  39. 7300
  40. 80

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