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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 935 · 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.The 3rd of a month is a Sunday. What day is the 11th of the same month? (a) Sunday (b) Thursday (c) Tuesday (d) Monday
  2. 2.Magic square (every row, column and diagonal has the same total): 17 ? 13 | 10 14 18 | 15 16 11. What is the missing number?
  3. 3.1 + 3 + 5 + … + 41 =
  4. 4.What comes next? 5, 10, 20, 40, ? (a) 81 (b) 80 (c) 60 (d) 70
  5. 5.Double 75 =
  6. 6.1 + 2 + 3 + … + 69 =
  7. 7.Do the 1089 trick with 300: reverse and subtract, then reverse that answer and add. What do you get?
  8. 8.The 7th of a month is a Wednesday. What day is the 24th of the same month? (a) Tuesday (b) Saturday (c) Friday (d) Sunday
  9. 9.?733 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.Magic square (every row, column and diagonal has the same total): 31 10 25 | 16 ? 28 | 19 34 13. What is the missing number?
  11. 11.If today is Sunday, what day will it be after 74 days? (a) Thursday (b) Wednesday (c) Friday (d) Sunday
  12. 12.54 × 4 =
  13. 13.993 × ? = 9930
  14. 14.20 × 4 =
  15. 15.Double 17 =
  16. 16.The 7th of a month is a Saturday. What day is the 22nd of the same month? (a) Monday (b) Saturday (c) Sunday (d) Wednesday
  17. 17.3 × 9 =
  18. 18.92? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.9 × 10 = ?0 — what is the missing digit?
  20. 20.Take 23 and take away the sum of its digits. What do you get?
  21. 21.Double 12 =
  22. 22.If today is Thursday, what day will it be after 86 days? (a) Friday (b) Sunday (c) Saturday (d) Tuesday
  23. 23.9 × 9 = ?1 — what is the missing digit?
  24. 24.1 + 2 + 3 + … + 64 =
  25. 25.37 × 9 =
  26. 26.44 × 1000 =
  27. 27.55 × 4 =
  28. 28.If today is Saturday, what day was it 14 days ago? (a) Friday (b) Tuesday (c) Saturday (d) Sunday
  29. 29.Magic square (every row, column and diagonal has the same total): 10 20 6 | ? 12 16 | 18 4 14. What is the missing number?
  30. 30.31 × 4 =
  31. 31.19 × 4 =
  32. 32.9 × 6 = 5? — what is the missing digit?
  33. 33.A piggy bank has 7 coins of ₹5 and 9 coins of ₹2. How many rupees are in it?
  34. 34.If today is Saturday, what day will it be after 73 days? (a) Tuesday (b) Monday (c) Friday (d) Wednesday
  35. 35.9 × 4 = 3? — what is the missing digit?
  36. 36.What comes next? 9, 16, 25, 36, ? (a) 49 (b) 47 (c) 51 (d) 50
  37. 37.Double 31 =
  38. 38.The ages of two twins add up to 24. How old is each twin?
  39. 39.9 × 9 = 8? — what is the missing digit?
  40. 40.123456 × 9 + 7 =

Answer key

  1. Monday
  2. 12
  3. 441
  4. 80
  5. 150
  6. 2415
  7. 1089
  8. Saturday
  9. 5
  10. 22
  11. Thursday
  12. 216
  13. 10
  14. 80
  15. 34
  16. Sunday
  17. 27
  18. 7
  19. 9
  20. 18
  21. 24
  22. Saturday
  23. 8
  24. 2080
  25. 333
  26. 44000
  27. 220
  28. Saturday
  29. 8
  30. 124
  31. 76
  32. 4
  33. 53
  34. Tuesday
  35. 6
  36. 49
  37. 62
  38. 12
  39. 1
  40. 1111111

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