← Mixed trick challenge lesson New set →

Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 915 · 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.Think of 5. Multiply it by 2, then add 6. What number do you end with?
  2. 2.1 + 2 + 3 + … + 9 =
  3. 3.Do the 1089 trick with 411: reverse and subtract, then reverse that answer and add. What do you get?
  4. 4.50 × 4 =
  5. 5.41 × 4 =
  6. 6.Double 74 =
  7. 7.228 × 10 =
  8. 8.2 × 9 =
  9. 9.363 × 10 =
  10. 10.9 × 6 = 5? — what is the missing digit?
  11. 11.If today is Tuesday, what day will it be after 39 days? (a) Saturday (b) Friday (c) Sunday (d) Tuesday
  12. 12.9 × 7 = ?3 — what is the missing digit?
  13. 13.Think of 13. Multiply it by 5, then add 6. What number do you end with?
  14. 14.A girl is 12 years old and her brother is 5 years older. How old will her brother be in 3 years?
  15. 15.9 × 6 =
  16. 16.The 9th of a month is a Sunday. What day is the 18th of the same month? (a) Wednesday (b) Friday (c) Tuesday (d) Monday
  17. 17.A piggy bank has 7 coins of ₹5 and 7 coins of ₹2. How many rupees are in it?
  18. 18.Take 29 and take away the sum of its digits. What do you get?
  19. 19.Do the 1089 trick with 900: reverse and subtract, then reverse that answer and add. What do you get?
  20. 20.46 × 4 =
  21. 21.1 + 2 + 3 + … + 10 =
  22. 22.Take 32 and take away the sum of its digits. What do you get?
  23. 23.1 + 2 + 3 + … + 91 =
  24. 24.5 × 9 =
  25. 25.Take 82 and take away the sum of its digits. What do you get?
  26. 26.1 + 3 + 5 + … + 19 =
  27. 27.?517 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.In 3 years a boy will be 17 years old. How old was he 4 years ago?
  29. 29.Magic square (every row, column and diagonal has the same total): 8 18 4 | 6 10 ? | 16 2 12. What is the missing number?
  30. 30.Magic square (every row, column and diagonal has the same total): 15 36 21 | ? 24 18 | 27 12 33. What is the missing number?
  31. 31.516 × 10 =
  32. 32.297 + 792 =
  33. 33.Do the 1089 trick with 871: reverse and subtract, then reverse that answer and add. What do you get?
  34. 34.2?98 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.If today is Wednesday, what day was it 36 days ago? (a) Friday (b) Wednesday (c) Monday (d) Tuesday
  36. 36.12345679 × 36 =
  37. 37.1 + 3 + 5 + … + 11 =
  38. 38.If today is Friday, what day will it be after 97 days? (a) Sunday (b) Wednesday (c) Thursday (d) Friday
  39. 39.11 × 4 =
  40. 40.Take 186. Reverse its digits and take the smaller number away from the bigger one. What do you get?

Answer key

  1. 16
  2. 45
  3. 1089
  4. 200
  5. 164
  6. 148
  7. 2280
  8. 18
  9. 3630
  10. 4
  11. Saturday
  12. 6
  13. 71
  14. 20
  15. 54
  16. Tuesday
  17. 49
  18. 18
  19. 1089
  20. 184
  21. 55
  22. 27
  23. 4186
  24. 45
  25. 72
  26. 100
  27. 5
  28. 10
  29. 14
  30. 30
  31. 5160
  32. 1089
  33. 1089
  34. 8
  35. Tuesday
  36. 444444444
  37. 36
  38. Thursday
  39. 44
  40. 495

Free maths tricks lessons, practice and worksheets at talentjr.in/maths-tricks