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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 287 · 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 + … + 37 =
  2. 2.25 × 4 =
  3. 3.Magic trick! Think of 14. Double it, add 14, halve it, then take away 14. What number do you get?
  4. 4.628 × ? = 6280
  5. 5.Double 86 =
  6. 6.9 × 10 = ?0 — what is the missing digit?
  7. 7.9 × 10 = 9? — what is the missing digit?
  8. 8.What comes next? 16, 25, 36, 49, ? (a) 64 (b) 66 (c) 62 (d) 65
  9. 9.Take 920. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  10. 10.47 × 100 =
  11. 11.The 8th of a month is a Tuesday. What day is the 23rd of the same month? (a) Saturday (b) Thursday (c) Wednesday (d) Tuesday
  12. 12.1 + 2 + 3 + … + 24 =
  13. 13.What comes next? 9, 16, 25, 36, ? (a) 51 (b) 47 (c) 50 (d) 49
  14. 14.89 × ? = 8900
  15. 15.The ages of two twins add up to 10. How old is each twin?
  16. 16.I thought of a number, added 1 and then doubled it. I got 12. What was my number?
  17. 17.3?77 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.In 6 years a boy will be 19 years old. How old was he 6 years ago?
  19. 19.The 1st of a month is a Wednesday. What day is the 10th of the same month? (a) Thursday (b) Friday (c) Saturday (d) Monday
  20. 20.89 × 100 =
  21. 21.I thought of a number, added 9 and then doubled it. I got 44. What was my number?
  22. 22.A piggy bank has 9 coins of ₹5 and 8 coins of ₹2. How many rupees are in it?
  23. 23.A girl is 9 years old and her brother is 2 years older. How old will her brother be in 6 years?
  24. 24.Magic square (every row, column and diagonal has the same total): 26 11 14 | 5 ? 29 | 20 23 8. What is the missing number?
  25. 25.Take 138. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  26. 26.59 × 4 =
  27. 27.What comes next? 8, 16, 24, 32, ? (a) 41 (b) 32 (c) 48 (d) 40
  28. 28.A piggy bank has 4 coins of ₹5 and 5 coins of ₹2. How many rupees are in it?
  29. 29.123456 × 9 + 7 =
  30. 30.What comes next? 4, 8, 16, 32, ? (a) 56 (b) 64 (c) 65 (d) 48
  31. 31.Half of 52 =
  32. 32.What comes next? 2, 5, 8, 11, ? (a) 17 (b) 15 (c) 11 (d) 14
  33. 33.27 × 4 =
  34. 34.Half of 126 =
  35. 35.A girl is 11 years old and her brother is 2 years older. How old will her brother be in 7 years?
  36. 36.What comes next? 5, 10, 20, 40, ? (a) 80 (b) 81 (c) 70 (d) 60
  37. 37.Double 31 =
  38. 38.1?61 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.Magic trick! Think of 13. Double it, add 4, halve it, then take away 13. What number do you get?
  40. 40.A girl is 5 years old and her brother is 5 years older. How old will her brother be in 2 years?

Answer key

  1. 361
  2. 100
  3. 7
  4. 10
  5. 172
  6. 9
  7. 0
  8. 64
  9. 891
  10. 4700
  11. Wednesday
  12. 300
  13. 49
  14. 100
  15. 5
  16. 5
  17. 1
  18. 7
  19. Friday
  20. 8900
  21. 13
  22. 61
  23. 17
  24. 17
  25. 693
  26. 236
  27. 40
  28. 30
  29. 1111111
  30. 64
  31. 26
  32. 14
  33. 108
  34. 63
  35. 20
  36. 80
  37. 62
  38. 1
  39. 2
  40. 12

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