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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 837 · 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.I thought of a number, multiplied it by 3 and added 3. I got 48. What was my number?
  2. 2.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
  3. 3.The 7th of a month is a Monday. What day is the 30th of the same month? (a) Wednesday (b) Tuesday (c) Thursday (d) Saturday
  4. 4.The 5th of a month is a Monday. What day is the 23rd of the same month? (a) Thursday (b) Monday (c) Friday (d) Saturday
  5. 5.The ages of two twins add up to 30. How old is each twin?
  6. 6.Double 77 =
  7. 7.5 × 9 =
  8. 8.9 × 10 = ?0 — what is the missing digit?
  9. 9.28 × 4 =
  10. 10.12345679 × 27 =
  11. 11.If today is Sunday, what day was it 23 days ago? (a) Monday (b) Friday (c) Thursday (d) Saturday
  12. 12.Magic square (every row, column and diagonal has the same total): 8 29 14 | 23 17 11 | ? 5 26. What is the missing number?
  13. 13.A piggy bank has 11 coins of ₹5 and 5 coins of ₹2. How many rupees are in it?
  14. 14.9 × 7 = 6? — what is the missing digit?
  15. 15.1 + 2 + 3 + … + 42 =
  16. 16.1 + 2 + 3 + … + 99 =
  17. 17.Half of 142 =
  18. 18.The 2nd of a month is a Monday. What day is the 18th of the same month? (a) Tuesday (b) Thursday (c) Saturday (d) Wednesday
  19. 19.1 + 3 + 5 + … + 39 =
  20. 20.9 × 8 = ?2 — what is the missing digit?
  21. 21.8?00 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.If today is Saturday, what day was it 38 days ago? (a) Saturday (b) Wednesday (c) Tuesday (d) Thursday
  23. 23.I thought of a number, multiplied it by 5 and added 8. I got 78. What was my number?
  24. 24.4 × 9 =
  25. 25.If today is Friday, what day was it 15 days ago? (a) Thursday (b) Sunday (c) Friday (d) Wednesday
  26. 26.593 × 10 =
  27. 27.In 5 years a boy will be 15 years old. How old was he 4 years ago?
  28. 28.792 + 297 =
  29. 29.Magic square (every row, column and diagonal has the same total): 13 10 25 | 28 16 4 | 7 22 ?. What is the missing number?
  30. 30.The 6th of a month is a Sunday. What day is the 22nd of the same month? (a) Monday (b) Wednesday (c) Friday (d) Tuesday
  31. 31.9 × 4 = 3? — what is the missing digit?
  32. 32.?055 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.1 + 2 + 3 + … + 6 =
  34. 34.3 × 100 =
  35. 35.14 × 4 =
  36. 36.48 × 1000 =
  37. 37.9 × 2 =
  38. 38.If today is Monday, what day will it be after 92 days? (a) Wednesday (b) Tuesday (c) Monday (d) Friday
  39. 39.198? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.Double 31 =

Answer key

  1. 15
  2. 396
  3. Wednesday
  4. Friday
  5. 15
  6. 154
  7. 45
  8. 9
  9. 112
  10. 333333333
  11. Friday
  12. 20
  13. 65
  14. 3
  15. 903
  16. 4950
  17. 71
  18. Wednesday
  19. 400
  20. 7
  21. 1
  22. Wednesday
  23. 14
  24. 36
  25. Thursday
  26. 5930
  27. 6
  28. 1089
  29. 19
  30. Tuesday
  31. 6
  32. 8
  33. 21
  34. 300
  35. 56
  36. 48000
  37. 18
  38. Tuesday
  39. 9
  40. 62

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