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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 644 · 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. 1.37 × 15 =
  2. 2.You have 11 coins. Each coin is ₹1 or ₹2, and together they make ₹16. How many ₹2 coins do you have?
  3. 3.If today is Thursday, what day will it be after 91 days? (a) Wednesday (b) Thursday (c) Friday (d) Sunday
  4. 4.Half of 126 =
  5. 5.If today is Saturday, what day will it be after 8 days? (a) Sunday (b) Wednesday (c) Monday (d) Saturday
  6. 6.9 × 2 = ?8 — what is the missing digit?
  7. 7.A father is 32 years old and his son is 9. How old was the father when the son was born?
  8. 8.Half of 36 =
  9. 9.9 × 9 =
  10. 10.1 + 2 + 3 + … + 17 =
  11. 11.Magic square (every row, column and diagonal has the same total): 17 19 9 | 7 15 ? | 21 11 13. What is the missing number?
  12. 12.2 × 9 =
  13. 13.Half of 174 =
  14. 14.177? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.1 + 3 + 5 + … + 49 =
  16. 16.Double 32 =
  17. 17.1 + 2 + 3 + … + 48 =
  18. 18.I thought of a number, added 8 and then doubled it. I got 36. What was my number?
  19. 19.Magic trick! Think of 11. Double it, add 10, halve it, then take away 11. What number do you get?
  20. 20.A girl is 8 years old and her brother is 6 years older. How old will her brother be in 4 years?
  21. 21.Magic square (every row, column and diagonal has the same total): 18 20 ? | 8 16 24 | 22 12 14. What is the missing number?
  22. 22.Do the 1089 trick with 139: reverse and subtract, then reverse that answer and add. What do you get?
  23. 23.Magic square (every row, column and diagonal has the same total): 11 25 15 | 21 ? 13 | 19 9 23. What is the missing number?
  24. 24.A father is 34 years old and his son is 5. How old was the father when the son was born?
  25. 25.If today is Tuesday, what day will it be after 29 days? (a) Tuesday (b) Wednesday (c) Thursday (d) Saturday
  26. 26.I thought of a number, multiplied it by 2 and added 8. I got 18. What was my number?
  27. 27.Do the 1089 trick with 910: reverse and subtract, then reverse that answer and add. What do you get?
  28. 28.58 × 100 =
  29. 29.In 6 years a boy will be 14 years old. How old was he 7 years ago?
  30. 30.What comes next? 10, 19, 28, 37, ? (a) 46 (b) 37 (c) 55 (d) 47
  31. 31.6 × 9 =
  32. 32.111111 × 111111 =
  33. 33.9 × 10 = 9? — what is the missing digit?
  34. 34.4 × 9 =
  35. 35.Magic square (every row, column and diagonal has the same total): 4 11 6 | 9 7 5 | 8 ? 10. What is the missing number?
  36. 36.68?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.What comes next? 6, 12, 18, 24, ? (a) 30 (b) 31 (c) 24 (d) 36
  38. 38.7 × 100 =
  39. 39.The 3rd of a month is a Tuesday. What day is the 28th of the same month? (a) Saturday (b) Tuesday (c) Friday (d) Sunday
  40. 40.Double 41 =

Answer key

  1. 555
  2. 5
  3. Thursday
  4. 63
  5. Sunday
  6. 1
  7. 23
  8. 18
  9. 81
  10. 153
  11. 23
  12. 18
  13. 87
  14. 3
  15. 625
  16. 64
  17. 1176
  18. 10
  19. 5
  20. 18
  21. 10
  22. 1089
  23. 17
  24. 29
  25. Wednesday
  26. 5
  27. 1089
  28. 5800
  29. 1
  30. 46
  31. 54
  32. 12345654321
  33. 0
  34. 36
  35. 3
  36. 1
  37. 30
  38. 700
  39. Saturday
  40. 82

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