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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 923 · 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. 1.1 + 3 + 5 + … + 41 =
  2. 2.A father is 40 years old and his son is 11. How old was the father when the son was born?
  3. 3.A piggy bank has 12 coins of ₹5 and 8 coins of ₹2. How many rupees are in it?
  4. 4.Double 54 =
  5. 5.1 + 2 + 3 + … + 86 =
  6. 6.6?22 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.Double 22 =
  8. 8.Take 156. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  9. 9.Magic trick! Think of 17. Double it, add 12, halve it, then take away 17. What number do you get?
  10. 10.What comes next? 10, 12, 14, 16, ? (a) 16 (b) 18 (c) 20 (d) 19
  11. 11.If today is Monday, what day will it be after 38 days? (a) Sunday (b) Wednesday (c) Friday (d) Thursday
  12. 12.81?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.Take 119. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  14. 14.Double 36 =
  15. 15.9 × 3 = 2? — what is the missing digit?
  16. 16.Take 74 and take away the sum of its digits. What do you get?
  17. 17.Take 58 and take away the sum of its digits. What do you get?
  18. 18.I thought of a number, added 4 and then doubled it. I got 40. What was my number?
  19. 19.9 × 4 =
  20. 20.792 + 297 =
  21. 21.40 × 4 =
  22. 22.10 × 1000 =
  23. 23.Odd one out: which number is NOT in the 8 times table? (a) 16 (b) 40 (c) 60 (d) 56
  24. 24.1 + 2 + 3 + … + 31 =
  25. 25.1 + 3 + 5 + … + 29 =
  26. 26.48 × 4 =
  27. 27.Odd one out: which number is NOT in the 5 times table? (a) 20 (b) 35 (c) 45 (d) 48
  28. 28.9 × 9 = 8? — what is the missing digit?
  29. 29.Magic trick! Think of 17. Double it, add 16, halve it, then take away 17. What number do you get?
  30. 30.9 × 8 = ?2 — what is the missing digit?
  31. 31.9 × 2 = ?8 — what is the missing digit?
  32. 32.If today is Friday, what day was it 17 days ago? (a) Friday (b) Tuesday (c) Monday (d) Wednesday
  33. 33.23 × 4 =
  34. 34.Half of 94 =
  35. 35.5 × 9 =
  36. 36.37 × 24 =
  37. 37.1 + 2 + 3 + … + 73 =
  38. 38.9 × 8 = 7? — what is the missing digit?
  39. 39.What comes next? 1, 2, 4, 8, ? (a) 14 (b) 16 (c) 17 (d) 12
  40. 40.I thought of a number, multiplied it by 4 and added 5. I got 25. What was my number?

Answer key

  1. 441
  2. 29
  3. 76
  4. 108
  5. 3741
  6. 8
  7. 44
  8. 495
  9. 6
  10. 18
  11. Thursday
  12. 9
  13. 792
  14. 72
  15. 7
  16. 63
  17. 45
  18. 16
  19. 36
  20. 1089
  21. 160
  22. 10000
  23. 60
  24. 496
  25. 225
  26. 192
  27. 48
  28. 1
  29. 8
  30. 7
  31. 1
  32. Tuesday
  33. 92
  34. 47
  35. 45
  36. 888
  37. 2701
  38. 2
  39. 16
  40. 5

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