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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 904 · 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 square (every row, column and diagonal has the same total): 26 29 14 | 11 23 35 | 32 17 ?. What is the missing number?
  2. 2.9 × 5 = 4? — what is the missing digit?
  3. 3.If today is Saturday, what day will it be after 86 days? (a) Tuesday (b) Sunday (c) Thursday (d) Monday
  4. 4.If today is Wednesday, what day will it be after 98 days? (a) Wednesday (b) Tuesday (c) Thursday (d) Saturday
  5. 5.What comes next? 16, 22, 28, 34, ? (a) 34 (b) 46 (c) 40 (d) 41
  6. 6.Take 980. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  7. 7.9 × 7 = 6? — what is the missing digit?
  8. 8.Double 75 =
  9. 9.52 × 4 =
  10. 10.316? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.If today is Thursday, what day will it be after 76 days? (a) Saturday (b) Wednesday (c) Tuesday (d) Thursday
  12. 12.If today is Saturday, what day was it 44 days ago? (a) Wednesday (b) Friday (c) Thursday (d) Sunday
  13. 13.9 × 8 = 7? — what is the missing digit?
  14. 14.The 8th of a month is a Thursday. What day is the 27th of the same month? (a) Monday (b) Tuesday (c) Friday (d) Wednesday
  15. 15.If today is Tuesday, what day will it be after 64 days? (a) Tuesday (b) Wednesday (c) Saturday (d) Thursday
  16. 16.Magic square (every row, column and diagonal has the same total): ? 34 19 | 28 22 16 | 25 10 31. What is the missing number?
  17. 17.495 + 594 =
  18. 18.1 + 2 + 3 + … + 17 =
  19. 19.Think of 3. Multiply it by 5, then add 9. What number do you end with?
  20. 20.What comes next? 5, 10, 20, 40, ? (a) 60 (b) 70 (c) 81 (d) 80
  21. 21.Double 96 =
  22. 22.Half of 64 =
  23. 23.I thought of a number, added 3 and then doubled it. I got 30. What was my number?
  24. 24.12345679 × 9 =
  25. 25.What comes next? 1, 4, 9, 16, ? (a) 27 (b) 23 (c) 25 (d) 26
  26. 26.Double 46 =
  27. 27.1 × 9 =
  28. 28.33 × 1000 =
  29. 29.1 + 2 + 3 + … + 87 =
  30. 30.37 × 12 =
  31. 31.9 × 6 = 5? — what is the missing digit?
  32. 32.Magic trick! Think of 5. Double it, add 8, halve it, then take away 5. What number do you get?
  33. 33.8 × 9 =
  34. 34.39 × 4 =
  35. 35.792 + 297 =
  36. 36.9 × 2 = 1? — what is the missing digit?
  37. 37.9 × 3 =
  38. 38.3 × ? = 300
  39. 39.1 + 2 + 3 + … + 90 =
  40. 40.54 × 4 =

Answer key

  1. 20
  2. 5
  3. Monday
  4. Wednesday
  5. 40
  6. 891
  7. 3
  8. 150
  9. 208
  10. 8
  11. Wednesday
  12. Thursday
  13. 2
  14. Tuesday
  15. Wednesday
  16. 13
  17. 1089
  18. 153
  19. 24
  20. 80
  21. 192
  22. 32
  23. 12
  24. 111111111
  25. 25
  26. 92
  27. 9
  28. 33000
  29. 3828
  30. 444
  31. 4
  32. 4
  33. 72
  34. 156
  35. 1089
  36. 8
  37. 27
  38. 100
  39. 4095
  40. 216

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