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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 146 · 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.Half of 52 =
  2. 2.Take 96 and take away the sum of its digits. What do you get?
  3. 3.You have 15 coins. Each coin is ₹1 or ₹2, and together they make ₹29. How many ₹2 coins do you have?
  4. 4.9 × 9 = ?1 — what is the missing digit?
  5. 5.11 × 4 =
  6. 6.9 × 4 =
  7. 7.9 × 5 = 4? — what is the missing digit?
  8. 8.I thought of a number, multiplied it by 4 and added 1. I got 25. What was my number?
  9. 9.850? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.Magic trick! Think of 11. Double it, add 12, halve it, then take away 11. What number do you get?
  11. 11.The 6th of a month is a Friday. What day is the 16th of the same month? (a) Sunday (b) Monday (c) Tuesday (d) Thursday
  12. 12.The 6th of a month is a Thursday. What day is the 24th of the same month? (a) Sunday (b) Monday (c) Thursday (d) Tuesday
  13. 13.Take 247. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  14. 14.Magic square (every row, column and diagonal has the same total): 10 3 8 | 5 7 ? | 6 11 4. What is the missing number?
  15. 15.A father is 32 years old and his son is 6. How old was the father when the son was born?
  16. 16.The 8th of a month is a Tuesday. What day is the 25th of the same month? (a) Friday (b) Saturday (c) Monday (d) Thursday
  17. 17.45 × 4 =
  18. 18.Take 11 and take away the sum of its digits. What do you get?
  19. 19.5 × 9 =
  20. 20.297 + 792 =
  21. 21.18 × 4 =
  22. 22.39 × 4 =
  23. 23.A girl is 6 years old and her brother is 3 years older. How old will her brother be in 5 years?
  24. 24.1111 × 1111 =
  25. 25.21 × 1000 =
  26. 26.37 × 3 =
  27. 27.9 × 9 =
  28. 28.1 × 9 =
  29. 29.You have 12 coins. Each coin is ₹1 or ₹2, and together they make ₹21. How many ₹2 coins do you have?
  30. 30.3 × 9 =
  31. 31.If today is Sunday, what day was it 57 days ago? (a) Tuesday (b) Saturday (c) Sunday (d) Friday
  32. 32.9 × 9 = 8? — what is the missing digit?
  33. 33.1 + 2 + 3 + … + 24 =
  34. 34.Half of 116 =
  35. 35.9 × 5 = ?5 — what is the missing digit?
  36. 36.14 × 4 =
  37. 37.558 × ? = 5580
  38. 38.Magic square (every row, column and diagonal has the same total): 29 14 17 | 8 20 ? | 23 26 11. What is the missing number?
  39. 39.9 × 4 = 3? — what is the missing digit?
  40. 40.Magic square (every row, column and diagonal has the same total): 25 10 ? | 4 16 28 | 19 22 7. What is the missing number?

Answer key

  1. 26
  2. 81
  3. 14
  4. 8
  5. 44
  6. 36
  7. 5
  8. 6
  9. 5
  10. 6
  11. Monday
  12. Monday
  13. 495
  14. 9
  15. 26
  16. Friday
  17. 180
  18. 9
  19. 45
  20. 1089
  21. 72
  22. 156
  23. 14
  24. 1234321
  25. 21000
  26. 111
  27. 81
  28. 9
  29. 9
  30. 27
  31. Saturday
  32. 1
  33. 300
  34. 58
  35. 4
  36. 56
  37. 10
  38. 32
  39. 6
  40. 13

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