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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 858 · 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 × 3 =
  2. 2.1 + 3 + 5 + … + 27 =
  3. 3.12 × 4 =
  4. 4.16?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.272 × 10 =
  6. 6.If today is Sunday, what day will it be after 18 days? (a) Thursday (b) Wednesday (c) Friday (d) Sunday
  7. 7.If today is Thursday, what day will it be after 17 days? (a) Monday (b) Saturday (c) Sunday (d) Wednesday
  8. 8.If today is Thursday, what day was it 60 days ago? (a) Saturday (b) Monday (c) Wednesday (d) Sunday
  9. 9.756 × ? = 7560
  10. 10.Half of 126 =
  11. 11.What comes next? 4, 9, 16, 25, ? (a) 36 (b) 34 (c) 38 (d) 37
  12. 12.If today is Monday, what day was it 57 days ago? (a) Saturday (b) Sunday (c) Wednesday (d) Monday
  13. 13.Double 93 =
  14. 14.Do the 1089 trick with 462: reverse and subtract, then reverse that answer and add. What do you get?
  15. 15.9 × 6 =
  16. 16.I thought of a number, multiplied it by 5 and added 7. I got 57. What was my number?
  17. 17.Magic square (every row, column and diagonal has the same total): 14 35 ? | 29 23 17 | 26 11 32. What is the missing number?
  18. 18.Take 99 and take away the sum of its digits. What do you get?
  19. 19.If today is Thursday, what day will it be after 13 days? (a) Thursday (b) Tuesday (c) Wednesday (d) Saturday
  20. 20.37 × 12 =
  21. 21.I thought of a number, multiplied it by 2 and added 2. I got 24. What was my number?
  22. 22.If today is Sunday, what day will it be after 81 days? (a) Sunday (b) Wednesday (c) Friday (d) Thursday
  23. 23.2?57 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.681? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.Magic square (every row, column and diagonal has the same total): 11 ? 15 | 16 12 8 | 9 14 13. What is the missing number?
  26. 26.9 × 7 =
  27. 27.1 + 3 + 5 + … + 15 =
  28. 28.Double 86 =
  29. 29.49 × 4 =
  30. 30.In 6 years a boy will be 15 years old. How old was he 7 years ago?
  31. 31.41 × 4 =
  32. 32.What comes next? 1, 2, 4, 8, ? (a) 12 (b) 14 (c) 17 (d) 16
  33. 33.The ages of two twins add up to 16. How old is each twin?
  34. 34.The ages of two twins add up to 20. How old is each twin?
  35. 35.10 × 9 =
  36. 36.123456 × 9 + 7 =
  37. 37.9 × 9 =
  38. 38.If today is Tuesday, what day was it 14 days ago? (a) Monday (b) Wednesday (c) Friday (d) Tuesday
  39. 39.?044 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.9 × 8 = 7? — what is the missing digit?

Answer key

  1. 27
  2. 196
  3. 48
  4. 4
  5. 2720
  6. Thursday
  7. Sunday
  8. Sunday
  9. 10
  10. 63
  11. 36
  12. Sunday
  13. 186
  14. 1089
  15. 54
  16. 10
  17. 20
  18. 81
  19. Wednesday
  20. 444
  21. 11
  22. Thursday
  23. 4
  24. 3
  25. 10
  26. 63
  27. 64
  28. 172
  29. 196
  30. 2
  31. 164
  32. 16
  33. 8
  34. 10
  35. 90
  36. 1111111
  37. 81
  38. Tuesday
  39. 1
  40. 2

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