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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 993 · 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. 1.9 × 6 =
  2. 2.The ages of two twins add up to 20. How old is each twin?
  3. 3.4 × 1000 =
  4. 4.9 × 6 = 5? — what is the missing digit?
  5. 5.Magic square (every row, column and diagonal has the same total): 10 24 14 | 20 ? 12 | 18 8 22. What is the missing number?
  6. 6.23 × ? = 23000
  7. 7.9 × 3 = 2? — what is the missing digit?
  8. 8.I thought of a number, multiplied it by 4 and added 1. I got 57. What was my number?
  9. 9.Magic trick! Think of 7. Double it, add 12, halve it, then take away 7. What number do you get?
  10. 10.What comes next? 10, 17, 24, 31, ? (a) 31 (b) 45 (c) 38 (d) 39
  11. 11.If today is Thursday, what day will it be after 51 days? (a) Friday (b) Saturday (c) Sunday (d) Tuesday
  12. 12.Magic square (every row, column and diagonal has the same total): 7 12 ? | 6 8 10 | 11 4 9. What is the missing number?
  13. 13.21 × 1000 =
  14. 14.14 × 1000 =
  15. 15.8 × 100 =
  16. 16.The ages of two twins add up to 26. How old is each twin?
  17. 17.What comes next? 1, 4, 9, 16, ? (a) 27 (b) 26 (c) 23 (d) 25
  18. 18.Magic square (every row, column and diagonal has the same total): 25 28 13 | 10 22 34 | 31 ? 19. What is the missing number?
  19. 19.If today is Saturday, what day was it 26 days ago? (a) Tuesday (b) Thursday (c) Monday (d) Sunday
  20. 20.594 + 495 =
  21. 21.The 5th of a month is a Saturday. What day is the 24th of the same month? (a) Wednesday (b) Thursday (c) Friday (d) Sunday
  22. 22.9 × 2 = 1? — what is the missing digit?
  23. 23.You have 11 coins. Each coin is ₹1 or ₹2, and together they make ₹17. How many ₹2 coins do you have?
  24. 24.Double 51 =
  25. 25.Do the 1089 trick with 970: reverse and subtract, then reverse that answer and add. What do you get?
  26. 26.9 × 10 = ?0 — what is the missing digit?
  27. 27.1 + 3 + 5 + … + 33 =
  28. 28.16 × 4 =
  29. 29.9 × 1 =
  30. 30.9 × 3 = ?7 — what is the missing digit?
  31. 31.Half of 74 =
  32. 32.2 × 9 =
  33. 33.Magic square (every row, column and diagonal has the same total): 4 ? 2 | 3 5 7 | 8 1 6. What is the missing number?
  34. 34.If today is Saturday, what day will it be after 91 days? (a) Saturday (b) Tuesday (c) Sunday (d) Friday
  35. 35.12345678 × 8 + 8 =
  36. 36.The ages of two twins add up to 16. How old is each twin?
  37. 37.The 1st of a month is a Saturday. What day is the 20th of the same month? (a) Thursday (b) Sunday (c) Friday (d) Wednesday
  38. 38.18 × 4 =
  39. 39.1234 × 8 + 4 =
  40. 40.3 × 9 =

Answer key

  1. 54
  2. 10
  3. 4000
  4. 4
  5. 16
  6. 1000
  7. 7
  8. 14
  9. 6
  10. 38
  11. Saturday
  12. 5
  13. 21000
  14. 14000
  15. 800
  16. 13
  17. 25
  18. 16
  19. Monday
  20. 1089
  21. Thursday
  22. 8
  23. 6
  24. 102
  25. 1089
  26. 9
  27. 289
  28. 64
  29. 9
  30. 2
  31. 37
  32. 18
  33. 9
  34. Saturday
  35. 98765432
  36. 8
  37. Thursday
  38. 72
  39. 9876
  40. 27

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