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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 930 · 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.Half of 132 =
  2. 2.If today is Saturday, what day will it be after 61 days? (a) Thursday (b) Wednesday (c) Sunday (d) Friday
  3. 3.1 + 2 + 3 + … + 53 =
  4. 4.412? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.1 + 2 + 3 + … + 66 =
  6. 6.Double 97 =
  7. 7.111 × 111 =
  8. 8.260 × 10 =
  9. 9.28 × 100 =
  10. 10.95 × ? = 950
  11. 11.12345679 × 18 =
  12. 12.3 × 9 =
  13. 13.Take 56 and take away the sum of its digits. What do you get?
  14. 14.9 × 9 =
  15. 15.I thought of a number, multiplied it by 4 and added 5. I got 61. What was my number?
  16. 16.9 × 2 = 1? — what is the missing digit?
  17. 17.Magic trick! Think of 3. Double it, add 12, halve it, then take away 3. What number do you get?
  18. 18.What comes next? 1, 5, 9, 13, ? (a) 21 (b) 17 (c) 18 (d) 13
  19. 19.A girl is 6 years old and her brother is 2 years older. How old will her brother be in 8 years?
  20. 20.I thought of a number, added 1 and then doubled it. I got 30. What was my number?
  21. 21.34 × 4 =
  22. 22.If today is Monday, what day was it 39 days ago? (a) Wednesday (b) Sunday (c) Friday (d) Thursday
  23. 23.8 × 9 =
  24. 24.9 × 4 = ?6 — what is the missing digit?
  25. 25.39 × 4 =
  26. 26.If today is Saturday, what day was it 19 days ago? (a) Thursday (b) Sunday (c) Monday (d) Tuesday
  27. 27.1 + 3 + 5 + … + 45 =
  28. 28.?151 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.If today is Monday, what day was it 21 days ago? (a) Monday (b) Thursday (c) Sunday (d) Tuesday
  30. 30.If today is Sunday, what day was it 32 days ago? (a) Saturday (b) Thursday (c) Tuesday (d) Wednesday
  31. 31.154 × ? = 1540
  32. 32.13?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.The ages of two twins add up to 24. How old is each twin?
  34. 34.14 × 4 =
  35. 35.37 × 3 =
  36. 36.9 × 4 = 3? — what is the missing digit?
  37. 37.1 + 2 + 3 + … + 100 =
  38. 38.111111 × 111111 =
  39. 39.Double 77 =
  40. 40.40 × 4 =

Answer key

  1. 66
  2. Thursday
  3. 1431
  4. 2
  5. 2211
  6. 194
  7. 12321
  8. 2600
  9. 2800
  10. 10
  11. 222222222
  12. 27
  13. 45
  14. 81
  15. 14
  16. 8
  17. 6
  18. 17
  19. 16
  20. 14
  21. 136
  22. Thursday
  23. 72
  24. 3
  25. 156
  26. Monday
  27. 529
  28. 2
  29. Monday
  30. Wednesday
  31. 10
  32. 6
  33. 12
  34. 56
  35. 111
  36. 6
  37. 5050
  38. 12345654321
  39. 154
  40. 160

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