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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 788 · 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 + 2 + 3 + … + 31 =
  2. 2.Double 89 =
  3. 3.111 × 111 =
  4. 4.?642 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.A father is 33 years old and his son is 4. How old was the father when the son was born?
  6. 6.If today is Thursday, what day will it be after 21 days? (a) Thursday (b) Friday (c) Sunday (d) Wednesday
  7. 7.If today is Sunday, what day will it be after 40 days? (a) Monday (b) Thursday (c) Saturday (d) Friday
  8. 8.What comes next? 1, 2, 4, 8, ? (a) 12 (b) 16 (c) 14 (d) 17
  9. 9.714 × 10 =
  10. 10.1 + 3 + 5 + … + 41 =
  11. 11.1234567 × 8 + 7 =
  12. 12.You have 11 coins. Each coin is ₹1 or ₹2, and together they make ₹19. How many ₹2 coins do you have?
  13. 13.708 × ? = 7080
  14. 14.Take 940. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  15. 15.Magic square (every row, column and diagonal has the same total): 13 ? 17 | 15 11 7 | 5 19 9. What is the missing number?
  16. 16.Take 910. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  17. 17.9 × 2 = ?8 — what is the missing digit?
  18. 18.9 × 9 =
  19. 19.Magic square (every row, column and diagonal has the same total): 17 ? 11 | 14 20 26 | 29 8 23. What is the missing number?
  20. 20.1111 × 1111 =
  21. 21.37 × 21 =
  22. 22.9 × 9 = ?1 — what is the missing digit?
  23. 23.1 + 3 + 5 + … + 43 =
  24. 24.15 × 4 =
  25. 25.If today is Friday, what day was it 49 days ago? (a) Thursday (b) Saturday (c) Friday (d) Monday
  26. 26.I thought of a number, multiplied it by 3 and added 8. I got 41. What was my number?
  27. 27.19 × ? = 19000
  28. 28.Think of 10. Multiply it by 2, then add 6. What number do you end with?
  29. 29.9 × 3 = 2? — what is the missing digit?
  30. 30.Magic square (every row, column and diagonal has the same total): ? 8 3 | 2 6 10 | 9 4 5. What is the missing number?
  31. 31.What comes next? 4, 8, 16, 32, ? (a) 56 (b) 65 (c) 64 (d) 48
  32. 32.9 × 4 =
  33. 33.17 × 4 =
  34. 34.Do the 1089 trick with 640: reverse and subtract, then reverse that answer and add. What do you get?
  35. 35.54 × 4 =
  36. 36.Take 702. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  37. 37.9 × 8 = ?2 — what is the missing digit?
  38. 38.The 8th of a month is a Sunday. What day is the 30th of the same month? (a) Tuesday (b) Monday (c) Thursday (d) Sunday
  39. 39.?897 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.32 × 4 =

Answer key

  1. 496
  2. 178
  3. 12321
  4. 6
  5. 29
  6. Thursday
  7. Friday
  8. 16
  9. 7140
  10. 441
  11. 9876543
  12. 8
  13. 10
  14. 891
  15. 3
  16. 891
  17. 1
  18. 81
  19. 32
  20. 1234321
  21. 777
  22. 8
  23. 484
  24. 60
  25. Friday
  26. 11
  27. 1000
  28. 26
  29. 7
  30. 7
  31. 64
  32. 36
  33. 68
  34. 1089
  35. 216
  36. 495
  37. 7
  38. Monday
  39. 3
  40. 128

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