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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 577 · 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. 1.4 × ? = 400
  2. 2.3?99 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.9 × 2 =
  4. 4.69 × 100 =
  5. 5.1 + 2 + 3 + … + 46 =
  6. 6.9 × 2 = 1? — what is the missing digit?
  7. 7.Magic square (every row, column and diagonal has the same total): 27 12 15 | 6 18 ? | 21 24 9. What is the missing number?
  8. 8.Double 17 =
  9. 9.9 × 5 =
  10. 10.10 × ? = 1000
  11. 11.Magic square (every row, column and diagonal has the same total): 13 23 9 | 11 ? 19 | 21 7 17. What is the missing number?
  12. 12.9 × 1000 =
  13. 13.The 7th of a month is a Thursday. What day is the 16th of the same month? (a) Sunday (b) Tuesday (c) Friday (d) Saturday
  14. 14.9 × 5 = 4? — what is the missing digit?
  15. 15.If today is Thursday, what day will it be after 43 days? (a) Friday (b) Saturday (c) Thursday (d) Monday
  16. 16.1 + 2 + 3 + … + 70 =
  17. 17.You have 12 coins. Each coin is ₹1 or ₹2, and together they make ₹21. How many ₹2 coins do you have?
  18. 18.Half of 64 =
  19. 19.Magic trick! Think of 4. Double it, add 18, halve it, then take away 4. What number do you get?
  20. 20.A girl is 9 years old and her brother is 2 years older. How old will her brother be in 7 years?
  21. 21.I thought of a number, multiplied it by 3 and added 4. I got 49. What was my number?
  22. 22.Do the 1089 trick with 930: reverse and subtract, then reverse that answer and add. What do you get?
  23. 23.32 × 4 =
  24. 24.1?89 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.If today is Wednesday, what day will it be after 66 days? (a) Tuesday (b) Friday (c) Saturday (d) Sunday
  26. 26.You have 15 coins. Each coin is ₹1 or ₹2, and together they make ₹19. How many ₹2 coins do you have?
  27. 27.If today is Monday, what day was it 40 days ago? (a) Tuesday (b) Thursday (c) Saturday (d) Wednesday
  28. 28.Magic square (every row, column and diagonal has the same total): 13 ? 25 | 28 16 4 | 7 22 19. What is the missing number?
  29. 29.If today is Sunday, what day was it 21 days ago? (a) Wednesday (b) Saturday (c) Monday (d) Sunday
  30. 30.If today is Thursday, what day will it be after 32 days? (a) Tuesday (b) Monday (c) Sunday (d) Thursday
  31. 31.123 × 9 + 4 =
  32. 32.Double 76 =
  33. 33.31 × 4 =
  34. 34.Half of 48 =
  35. 35.A father is 34 years old and his son is 4. How old was the father when the son was born?
  36. 36.683 × 10 =
  37. 37.In 5 years a boy will be 14 years old. How old was he 4 years ago?
  38. 38.11?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.Half of 42 =
  40. 40.39 × 100 =

Answer key

  1. 100
  2. 6
  3. 18
  4. 6900
  5. 1081
  6. 8
  7. 30
  8. 34
  9. 45
  10. 100
  11. 15
  12. 9000
  13. Saturday
  14. 5
  15. Friday
  16. 2485
  17. 9
  18. 32
  19. 9
  20. 18
  21. 15
  22. 1089
  23. 128
  24. 9
  25. Saturday
  26. 4
  27. Wednesday
  28. 10
  29. Sunday
  30. Monday
  31. 1111
  32. 152
  33. 124
  34. 24
  35. 30
  36. 6830
  37. 5
  38. 1
  39. 21
  40. 3900

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