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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 775 · 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.Magic trick! Think of 9. Double it, add 16, halve it, then take away 9. What number do you get?
  2. 2.I thought of a number, added 3 and then doubled it. I got 40. What was my number?
  3. 3.Half of 52 =
  4. 4.123456789 × 8 + 9 =
  5. 5.Magic square (every row, column and diagonal has the same total): 10 17 12 | 15 ? 11 | 14 9 16. What is the missing number?
  6. 6.Magic square (every row, column and diagonal has the same total): ? 10 15 | 16 12 8 | 9 14 13. What is the missing number?
  7. 7.179 × ? = 1790
  8. 8.9 × 8 = ?2 — what is the missing digit?
  9. 9.Double 32 =
  10. 10.22 × ? = 2200
  11. 11.I thought of a number, added 3 and then doubled it. I got 18. What was my number?
  12. 12.1 + 2 + 3 + … + 99 =
  13. 13.You have 6 coins. Each coin is ₹1 or ₹2, and together they make ₹11. How many ₹2 coins do you have?
  14. 14.Magic square (every row, column and diagonal has the same total): 4 ? 12 | 18 10 2 | 8 6 16. What is the missing number?
  15. 15.Magic square (every row, column and diagonal has the same total): ? 8 29 | 26 20 14 | 11 32 17. What is the missing number?
  16. 16.1 + 2 + 3 + … + 18 =
  17. 17.Double 22 =
  18. 18.Magic square (every row, column and diagonal has the same total): 10 17 12 | 15 13 11 | 14 ? 16. What is the missing number?
  19. 19.9 × 2 =
  20. 20.If today is Wednesday, what day will it be after 71 days? (a) Wednesday (b) Thursday (c) Sunday (d) Friday
  21. 21.42 × 4 =
  22. 22.If today is Saturday, what day will it be after 75 days? (a) Friday (b) Sunday (c) Wednesday (d) Thursday
  23. 23.12 × 8 + 2 =
  24. 24.If today is Monday, what day was it 36 days ago? (a) Sunday (b) Monday (c) Wednesday (d) Saturday
  25. 25.Half of 14 =
  26. 26.Take 44 and take away the sum of its digits. What do you get?
  27. 27.560 × ? = 5600
  28. 28.1 × 9 =
  29. 29.Double 93 =
  30. 30.9 × 1 =
  31. 31.9 × 2 = ?8 — what is the missing digit?
  32. 32.9 × 7 =
  33. 33.5 × 9 =
  34. 34.If today is Monday, what day was it 10 days ago? (a) Friday (b) Monday (c) Thursday (d) Saturday
  35. 35.You have 14 coins. Each coin is ₹1 or ₹2, and together they make ₹16. How many ₹2 coins do you have?
  36. 36.If today is Friday, what day will it be after 90 days? (a) Sunday (b) Friday (c) Thursday (d) Wednesday
  37. 37.32 × 1000 =
  38. 38.Double 46 =
  39. 39.Magic square (every row, column and diagonal has the same total): 8 1 6 | 3 ? 7 | 4 9 2. What is the missing number?
  40. 40.9 × 9 =

Answer key

  1. 8
  2. 17
  3. 26
  4. 987654321
  5. 13
  6. 11
  7. 10
  8. 7
  9. 64
  10. 100
  11. 6
  12. 4950
  13. 5
  14. 14
  15. 23
  16. 171
  17. 44
  18. 9
  19. 18
  20. Thursday
  21. 168
  22. Thursday
  23. 98
  24. Sunday
  25. 7
  26. 36
  27. 10
  28. 9
  29. 186
  30. 9
  31. 1
  32. 63
  33. 45
  34. Friday
  35. 2
  36. Thursday
  37. 32000
  38. 92
  39. 5
  40. 81

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