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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 413 · 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. 1.105 × 10 =
  2. 2.If today is Friday, what day was it 21 days ago? (a) Friday (b) Monday (c) Saturday (d) Thursday
  3. 3.9 × 5 =
  4. 4.Odd one out: which number is NOT in the 6 times table? (a) 36 (b) 41 (c) 54 (d) 24
  5. 5.What comes next? 5, 10, 20, 40, ? (a) 81 (b) 80 (c) 70 (d) 60
  6. 6.9 × 9 =
  7. 7.9 × 10 = 9? — what is the missing digit?
  8. 8.What comes next? 4, 8, 16, 32, ? (a) 64 (b) 65 (c) 56 (d) 48
  9. 9.You have 14 coins. Each coin is ₹1 or ₹2, and together they make ₹19. How many ₹2 coins do you have?
  10. 10.If today is Sunday, what day will it be after 29 days? (a) Tuesday (b) Sunday (c) Thursday (d) Monday
  11. 11.The 8th of a month is a Friday. What day is the 26th of the same month? (a) Monday (b) Wednesday (c) Friday (d) Tuesday
  12. 12.The 6th of a month is a Friday. What day is the 18th of the same month? (a) Saturday (b) Tuesday (c) Thursday (d) Wednesday
  13. 13.7 × 4 =
  14. 14.6?83 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.12 × 4 =
  16. 16.What comes next? 20, 29, 38, 47, ? (a) 56 (b) 65 (c) 57 (d) 47
  17. 17.9 × 9 = ?1 — what is the missing digit?
  18. 18.26 × 100 =
  19. 19.9 × 4 =
  20. 20.You have 15 coins. Each coin is ₹1 or ₹2, and together they make ₹28. How many ₹2 coins do you have?
  21. 21.A father is 41 years old and his son is 8. How old was the father when the son was born?
  22. 22.3 × 9 =
  23. 23.You have 6 coins. Each coin is ₹1 or ₹2, and together they make ₹7. How many ₹2 coins do you have?
  24. 24.37 × 27 =
  25. 25.Double 24 =
  26. 26.1 + 3 + 5 + … + 17 =
  27. 27.9 × 10 = ?0 — what is the missing digit?
  28. 28.39 × 4 =
  29. 29.A piggy bank has 2 coins of ₹5 and 10 coins of ₹2. How many rupees are in it?
  30. 30.The 2nd of a month is a Thursday. What day is the 25th of the same month? (a) Saturday (b) Sunday (c) Tuesday (d) Friday
  31. 31.47 × 1000 =
  32. 32.Take 97 and take away the sum of its digits. What do you get?
  33. 33.I thought of a number, added 3 and then doubled it. I got 46. What was my number?
  34. 34.The 6th of a month is a Monday. What day is the 30th of the same month? (a) Friday (b) Sunday (c) Thursday (d) Wednesday
  35. 35.9 × 3 = ?7 — what is the missing digit?
  36. 36.28 × 4 =
  37. 37.12345679 × 27 =
  38. 38.9 × 3 = 2? — what is the missing digit?
  39. 39.Magic trick! Think of 20. Double it, add 6, halve it, then take away 20. What number do you get?
  40. 40.Magic square (every row, column and diagonal has the same total): 5 15 13 | 19 ? 3 | 9 7 17. What is the missing number?

Answer key

  1. 1050
  2. Friday
  3. 45
  4. 41
  5. 80
  6. 81
  7. 0
  8. 64
  9. 5
  10. Monday
  11. Tuesday
  12. Wednesday
  13. 28
  14. 1
  15. 48
  16. 56
  17. 8
  18. 2600
  19. 36
  20. 13
  21. 33
  22. 27
  23. 1
  24. 999
  25. 48
  26. 81
  27. 9
  28. 156
  29. 30
  30. Saturday
  31. 47000
  32. 81
  33. 20
  34. Thursday
  35. 2
  36. 112
  37. 333333333
  38. 7
  39. 3
  40. 11

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