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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 523 · 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 × 5 =
  2. 2.If today is Sunday, what day will it be after 9 days? (a) Tuesday (b) Friday (c) Monday (d) Wednesday
  3. 3.1 + 2 + 3 + … + 74 =
  4. 4.Magic trick! Think of 19. Double it, add 14, halve it, then take away 19. What number do you get?
  5. 5.If today is Sunday, what day will it be after 20 days? (a) Tuesday (b) Sunday (c) Friday (d) Saturday
  6. 6.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
  7. 7.Magic square (every row, column and diagonal has the same total): 10 15 8 | 9 11 13 | 14 ? 12. What is the missing number?
  8. 8.A father is 30 years old and his son is 7. How old was the father when the son was born?
  9. 9.The 1st of a month is a Sunday. What day is the 11th of the same month? (a) Thursday (b) Tuesday (c) Saturday (d) Wednesday
  10. 10.Magic square (every row, column and diagonal has the same total): 12 ? 8 | 5 9 13 | 10 11 6. What is the missing number?
  11. 11.1 × 9 =
  12. 12.Double 73 =
  13. 13.What comes next? 2, 7, 12, 17, ? (a) 17 (b) 23 (c) 22 (d) 27
  14. 14.10 × 4 =
  15. 15.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
  16. 16.32 × 1000 =
  17. 17.A girl is 11 years old and her brother is 4 years older. How old will her brother be in 3 years?
  18. 18.I thought of a number, added 5 and then doubled it. I got 50. What was my number?
  19. 19.2 × 9 =
  20. 20.The 8th of a month is a Friday. What day is the 16th of the same month? (a) Friday (b) Tuesday (c) Saturday (d) Sunday
  21. 21.The 2nd of a month is a Saturday. What day is the 22nd of the same month? (a) Saturday (b) Friday (c) Monday (d) Thursday
  22. 22.1 + 2 + 3 + … + 70 =
  23. 23.Odd one out: which number is NOT in the 6 times table? (a) 33 (b) 36 (c) 48 (d) 24
  24. 24.9 × 4 =
  25. 25.15 × 4 =
  26. 26.9 × 8 = 7? — what is the missing digit?
  27. 27.9 × 9 =
  28. 28.9 × 9 = ?1 — what is the missing digit?
  29. 29.Magic square (every row, column and diagonal has the same total): 22 25 10 | 7 ? 31 | 28 13 16. What is the missing number?
  30. 30.808? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.9 × 4 = ?6 — what is the missing digit?
  32. 32.Think of 9. Multiply it by 2, then add 3. What number do you end with?
  33. 33.Magic square (every row, column and diagonal has the same total): 8 ? 4 | 3 7 11 | 10 5 6. What is the missing number?
  34. 34.What comes next? 3, 6, 12, 24, ? (a) 49 (b) 48 (c) 36 (d) 42
  35. 35.Half of 116 =
  36. 36.58 × 4 =
  37. 37.Half of 96 =
  38. 38.198 + 891 =
  39. 39.Half of 72 =
  40. 40.1 + 2 + 3 + … + 93 =

Answer key

  1. 45
  2. Tuesday
  3. 2775
  4. 7
  5. Saturday
  6. 891
  7. 7
  8. 23
  9. Wednesday
  10. 7
  11. 9
  12. 146
  13. 22
  14. 40
  15. 396
  16. 32000
  17. 18
  18. 20
  19. 18
  20. Saturday
  21. Friday
  22. 2485
  23. 33
  24. 36
  25. 60
  26. 2
  27. 81
  28. 8
  29. 19
  30. 2
  31. 3
  32. 21
  33. 9
  34. 48
  35. 58
  36. 232
  37. 48
  38. 1089
  39. 36
  40. 4371

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