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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 855 · 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. 1.63 × 100 =
  2. 2.The ages of two twins add up to 18. How old is each twin?
  3. 3.19 × 4 =
  4. 4.86?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.The ages of two twins add up to 16. How old is each twin?
  6. 6.24 × 4 =
  7. 7.9 × 3 = 2? — what is the missing digit?
  8. 8.Half of 144 =
  9. 9.I thought of a number, multiplied it by 4 and added 9. I got 33. What was my number?
  10. 10.The 8th of a month is a Friday. What day is the 24th of the same month? (a) Wednesday (b) Sunday (c) Saturday (d) Monday
  11. 11.Magic square (every row, column and diagonal has the same total): 13 ? 19 | 28 22 16 | 25 10 31. What is the missing number?
  12. 12.488 × ? = 4880
  13. 13.1 + 2 + 3 + … + 17 =
  14. 14.I thought of a number, multiplied it by 5 and added 9. I got 44. What was my number?
  15. 15.Magic square (every row, column and diagonal has the same total): ? 13 12 | 15 11 7 | 10 9 14. What is the missing number?
  16. 16.The ages of two twins add up to 30. How old is each twin?
  17. 17.A father is 43 years old and his son is 9. How old was the father when the son was born?
  18. 18.9 × 10 =
  19. 19.9 × 2 = ?8 — what is the missing digit?
  20. 20.If today is Monday, what day was it 26 days ago? (a) Thursday (b) Saturday (c) Wednesday (d) Tuesday
  21. 21.898 × ? = 8980
  22. 22.Magic square (every row, column and diagonal has the same total): ? 5 10 | 11 7 3 | 4 9 8. What is the missing number?
  23. 23.Odd one out: which number is NOT in the 4 times table? (a) 32 (b) 16 (c) 26 (d) 20
  24. 24.8 × 9 =
  25. 25.What comes next? 3, 12, 21, 30, ? (a) 30 (b) 40 (c) 48 (d) 39
  26. 26.19 × ? = 1900
  27. 27.5 × 100 =
  28. 28.I thought of a number, added 6 and then doubled it. I got 52. What was my number?
  29. 29.1 + 3 + 5 + … + 29 =
  30. 30.694 × ? = 6940
  31. 31.What comes next? 11, 14, 17, 20, ? (a) 20 (b) 23 (c) 26 (d) 24
  32. 32.1 + 3 + 5 + … + 25 =
  33. 33.If today is Sunday, what day will it be after 23 days? (a) Wednesday (b) Tuesday (c) Friday (d) Monday
  34. 34.1111 × 1111 =
  35. 35.198 + 891 =
  36. 36.3 × 9 =
  37. 37.7 × 9 =
  38. 38.4?59 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.Take 99 and take away the sum of its digits. What do you get?
  40. 40.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?

Answer key

  1. 6300
  2. 9
  3. 76
  4. 9
  5. 8
  6. 96
  7. 7
  8. 72
  9. 6
  10. Sunday
  11. 34
  12. 10
  13. 153
  14. 7
  15. 8
  16. 15
  17. 34
  18. 90
  19. 1
  20. Wednesday
  21. 10
  22. 6
  23. 26
  24. 72
  25. 39
  26. 100
  27. 500
  28. 20
  29. 225
  30. 10
  31. 23
  32. 169
  33. Tuesday
  34. 1234321
  35. 1089
  36. 27
  37. 63
  38. 9
  39. 81
  40. 891

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