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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 854 · 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.A girl is 12 years old and her brother is 4 years older. How old will her brother be in 6 years?
  2. 2.Double 61 =
  3. 3.14 × 4 =
  4. 4.What comes next? 2, 4, 8, 16, ? (a) 33 (b) 28 (c) 32 (d) 24
  5. 5.What comes next? 1, 4, 9, 16, ? (a) 23 (b) 25 (c) 26 (d) 27
  6. 6.Double 29 =
  7. 7.What comes next? 3, 6, 12, 24, ? (a) 42 (b) 48 (c) 49 (d) 36
  8. 8.Magic square (every row, column and diagonal has the same total): 23 8 ? | 26 20 14 | 11 32 17. What is the missing number?
  9. 9.16 × 4 =
  10. 10.Double 35 =
  11. 11.If today is Wednesday, what day will it be after 62 days? (a) Wednesday (b) Monday (c) Friday (d) Tuesday
  12. 12.1 + 2 + 3 + … + 72 =
  13. 13.The 5th of a month is a Saturday. What day is the 23rd of the same month? (a) Wednesday (b) Tuesday (c) Thursday (d) Saturday
  14. 14.8 × 9 =
  15. 15.12345679 × 72 =
  16. 16.1 + 2 + 3 + … + 88 =
  17. 17.In 5 years a boy will be 18 years old. How old was he 3 years ago?
  18. 18.9 × 10 = 9? — what is the missing digit?
  19. 19.3 × 9 =
  20. 20.Magic square (every row, column and diagonal has the same total): ? 29 14 | 11 23 35 | 32 17 20. What is the missing number?
  21. 21.What comes next? 9, 16, 25, 36, ? (a) 51 (b) 47 (c) 49 (d) 50
  22. 22.If today is Thursday, what day will it be after 90 days? (a) Saturday (b) Wednesday (c) Tuesday (d) Thursday
  23. 23.7 × 1000 =
  24. 24.What comes next? 19, 21, 23, 25, ? (a) 25 (b) 28 (c) 27 (d) 29
  25. 25.80?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.Magic square (every row, column and diagonal has the same total): 31 16 19 | 10 22 34 | 25 28 ?. What is the missing number?
  27. 27.13 × 1000 =
  28. 28.What comes next? 19, 25, 31, 37, ? (a) 44 (b) 43 (c) 37 (d) 49
  29. 29.I thought of a number, multiplied it by 3 and added 7. I got 34. What was my number?
  30. 30.9 × 7 = 6? — what is the missing digit?
  31. 31.9 × 3 = ?7 — what is the missing digit?
  32. 32.128? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.Magic square (every row, column and diagonal has the same total): 26 11 32 | 29 ? 17 | 14 35 20. What is the missing number?
  34. 34.Magic square (every row, column and diagonal has the same total): 11 4 9 | 6 8 10 | ? 12 5. What is the missing number?
  35. 35.A father is 43 years old and his son is 7. How old was the father when the son was born?
  36. 36.Magic trick! Think of 17. Double it, add 14, halve it, then take away 17. What number do you get?
  37. 37.Take 19 and take away the sum of its digits. What do you get?
  38. 38.10 × 9 =
  39. 39.12345 × 8 + 5 =
  40. 40.If today is Sunday, what day was it 40 days ago? (a) Monday (b) Tuesday (c) Wednesday (d) Friday

Answer key

  1. 22
  2. 122
  3. 56
  4. 32
  5. 25
  6. 58
  7. 48
  8. 29
  9. 64
  10. 70
  11. Tuesday
  12. 2628
  13. Wednesday
  14. 72
  15. 888888888
  16. 3916
  17. 10
  18. 0
  19. 27
  20. 26
  21. 49
  22. Wednesday
  23. 7000
  24. 27
  25. 1
  26. 13
  27. 13000
  28. 43
  29. 9
  30. 3
  31. 2
  32. 7
  33. 23
  34. 7
  35. 36
  36. 7
  37. 9
  38. 90
  39. 98765
  40. Tuesday

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