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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 934 · 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.Double 27 =
  2. 2.Do the 1089 trick with 280: reverse and subtract, then reverse that answer and add. What do you get?
  3. 3.9 × 9 =
  4. 4.12345 × 8 + 5 =
  5. 5.A father is 43 years old and his son is 14. How old was the father when the son was born?
  6. 6.Think of 15. Multiply it by 4, then add 1. What number do you end with?
  7. 7.If today is Wednesday, what day will it be after 50 days? (a) Wednesday (b) Friday (c) Sunday (d) Thursday
  8. 8.37 × 3 =
  9. 9.9 × 5 = ?5 — what is the missing digit?
  10. 10.4 × 9 =
  11. 11.Double 69 =
  12. 12.Think of 12. Multiply it by 2, then add 3. What number do you end with?
  13. 13.If today is Thursday, what day will it be after 20 days? (a) Saturday (b) Tuesday (c) Thursday (d) Wednesday
  14. 14.10 × 4 =
  15. 15.889 × ? = 8890
  16. 16.9 × 7 = ?3 — what is the missing digit?
  17. 17.10 × 9 =
  18. 18.I thought of a number, added 8 and then doubled it. I got 54. What was my number?
  19. 19.What comes next? 1, 4, 9, 16, ? (a) 25 (b) 27 (c) 23 (d) 26
  20. 20.9 × 3 =
  21. 21.1 + 2 + 3 + … + 85 =
  22. 22.7 × 4 =
  23. 23.9 × 10 = 9? — what is the missing digit?
  24. 24.7 × 9 =
  25. 25.Take 19 and take away the sum of its digits. What do you get?
  26. 26.Magic trick! Think of 14. Double it, add 4, halve it, then take away 14. What number do you get?
  27. 27.What comes next? 9, 14, 19, 24, ? (a) 24 (b) 34 (c) 29 (d) 30
  28. 28.33 × 1000 =
  29. 29.If today is Sunday, what day was it 20 days ago? (a) Sunday (b) Tuesday (c) Thursday (d) Monday
  30. 30.4?81 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.What comes next? 4, 8, 16, 32, ? (a) 48 (b) 65 (c) 64 (d) 56
  32. 32.I thought of a number, added 2 and then doubled it. I got 32. What was my number?
  33. 33.Double 37 =
  34. 34.A girl is 6 years old and her brother is 3 years older. How old will her brother be in 8 years?
  35. 35.2 × ? = 2000
  36. 36.A piggy bank has 6 coins of ₹5 and 5 coins of ₹2. How many rupees are in it?
  37. 37.1 + 2 + 3 + … + 55 =
  38. 38.1 + 3 + 5 + … + 47 =
  39. 39.Half of 92 =
  40. 40.1234 × 9 + 5 =

Answer key

  1. 54
  2. 1089
  3. 81
  4. 98765
  5. 29
  6. 61
  7. Thursday
  8. 111
  9. 4
  10. 36
  11. 138
  12. 27
  13. Wednesday
  14. 40
  15. 10
  16. 6
  17. 90
  18. 19
  19. 25
  20. 27
  21. 3655
  22. 28
  23. 0
  24. 63
  25. 9
  26. 2
  27. 29
  28. 33000
  29. Monday
  30. 5
  31. 64
  32. 14
  33. 74
  34. 17
  35. 1000
  36. 40
  37. 1540
  38. 576
  39. 46
  40. 11111

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