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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 122 · 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. 1.1234567 × 9 + 8 =
  2. 2.Magic square (every row, column and diagonal has the same total): 10 25 22 | 31 ? 7 | 16 13 28. What is the missing number?
  3. 3.36 × 4 =
  4. 4.1 + 2 + 3 + … + 16 =
  5. 5.111 × 111 =
  6. 6.If today is Friday, what day will it be after 76 days? (a) Wednesday (b) Thursday (c) Friday (d) Sunday
  7. 7.What comes next? 3, 10, 17, 24, ? (a) 24 (b) 32 (c) 31 (d) 38
  8. 8.891 + 198 =
  9. 9.5 × 1000 =
  10. 10.275? 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 Tuesday, what day was it 11 days ago? (a) Saturday (b) Thursday (c) Friday (d) Monday
  12. 12.Magic square (every row, column and diagonal has the same total): 13 28 25 | 34 ? 10 | 19 16 31. What is the missing number?
  13. 13.1 + 2 + 3 + … + 82 =
  14. 14.I thought of a number, added 2 and then doubled it. I got 40. What was my number?
  15. 15.Magic square (every row, column and diagonal has the same total): 20 5 26 | 23 ? 11 | 8 29 14. What is the missing number?
  16. 16.A father is 37 years old and his son is 12. How old was the father when the son was born?
  17. 17.If today is Tuesday, what day will it be after 24 days? (a) Friday (b) Saturday (c) Thursday (d) Monday
  18. 18.Half of 198 =
  19. 19.Magic square (every row, column and diagonal has the same total): 10 25 22 | ? 19 7 | 16 13 28. What is the missing number?
  20. 20.123 × 8 + 3 =
  21. 21.Magic square (every row, column and diagonal has the same total): ? 9 24 | 15 21 27 | 18 33 12. What is the missing number?
  22. 22.A father is 44 years old and his son is 7. How old was the father when the son was born?
  23. 23.1 + 3 + 5 + … + 49 =
  24. 24.Magic trick! Think of 14. Double it, add 6, halve it, then take away 14. What number do you get?
  25. 25.9 × 5 = ?5 — what is the missing digit?
  26. 26.5 × 9 =
  27. 27.9 × 5 = 4? — what is the missing digit?
  28. 28.The 5th of a month is a Saturday. What day is the 20th of the same month? (a) Sunday (b) Monday (c) Wednesday (d) Saturday
  29. 29.What comes next? 12, 16, 20, 24, ? (a) 32 (b) 29 (c) 24 (d) 28
  30. 30.If today is Wednesday, what day was it 56 days ago? (a) Wednesday (b) Saturday (c) Thursday (d) Tuesday
  31. 31.224? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.Think of 13. Multiply it by 5, then add 2. What number do you end with?
  33. 33.8 × 9 =
  34. 34.9 × 8 =
  35. 35.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
  36. 36.1 + 3 + 5 + … + 45 =
  37. 37.706 × 10 =
  38. 38.9 × 6 =
  39. 39.111111 × 111111 =
  40. 40.7 × 9 =

Answer key

  1. 11111111
  2. 19
  3. 144
  4. 136
  5. 12321
  6. Thursday
  7. 31
  8. 1089
  9. 5000
  10. 4
  11. Friday
  12. 22
  13. 3403
  14. 18
  15. 17
  16. 25
  17. Friday
  18. 99
  19. 31
  20. 987
  21. 30
  22. 37
  23. 625
  24. 3
  25. 4
  26. 45
  27. 5
  28. Sunday
  29. 28
  30. Wednesday
  31. 1
  32. 67
  33. 72
  34. 72
  35. 693
  36. 529
  37. 7060
  38. 54
  39. 12345654321
  40. 63

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