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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 154 · 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.I thought of a number, added 1 and then doubled it. I got 22. What was my number?
  2. 2.9 × 5 = 4? — what is the missing digit?
  3. 3.1 + 2 + 3 + … + 20 =
  4. 4.A girl is 5 years old and her brother is 6 years older. How old will her brother be in 2 years?
  5. 5.30 × 4 =
  6. 6.Double 29 =
  7. 7.Magic square (every row, column and diagonal has the same total): 18 20 10 | 8 16 24 | ? 12 14. What is the missing number?
  8. 8.1234 × 9 + 5 =
  9. 9.78 × 100 =
  10. 10.Take 47 and take away the sum of its digits. What do you get?
  11. 11.Magic square (every row, column and diagonal has the same total): ? 15 10 | 9 13 17 | 16 11 12. What is the missing number?
  12. 12.78 × ? = 7800
  13. 13.Magic square (every row, column and diagonal has the same total): 18 15 30 | 33 ? 9 | 12 27 24. What is the missing number?
  14. 14.3?22 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.Half of 102 =
  16. 16.I thought of a number, multiplied it by 2 and added 9. I got 39. What was my number?
  17. 17.Think of 5. Multiply it by 4, then add 6. What number do you end with?
  18. 18.Take 24 and take away the sum of its digits. What do you get?
  19. 19.10 × 9 =
  20. 20.A girl is 11 years old and her brother is 5 years older. How old will her brother be in 5 years?
  21. 21.41 × 4 =
  22. 22.15 × 1000 =
  23. 23.123 × 9 + 4 =
  24. 24.9 × 8 =
  25. 25.9 × 10 = 9? — what is the missing digit?
  26. 26.1 + 2 + 3 + … + 73 =
  27. 27.1 + 3 + 5 + … + 19 =
  28. 28.Half of 98 =
  29. 29.The 1st of a month is a Tuesday. What day is the 14th of the same month? (a) Thursday (b) Monday (c) Tuesday (d) Sunday
  30. 30.1 + 2 + 3 + … + 77 =
  31. 31.Double 95 =
  32. 32.If today is Wednesday, what day will it be after 85 days? (a) Wednesday (b) Friday (c) Sunday (d) Thursday
  33. 33.?331 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.Take 37 and take away the sum of its digits. What do you get?
  35. 35.9 × 9 =
  36. 36.12345679 × 63 =
  37. 37.What comes next? 5, 10, 20, 40, ? (a) 81 (b) 60 (c) 70 (d) 80
  38. 38.If today is Friday, what day will it be after 71 days? (a) Tuesday (b) Friday (c) Sunday (d) Saturday
  39. 39.1 + 2 + 3 + … + 67 =
  40. 40.?512 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

  1. 10
  2. 5
  3. 210
  4. 13
  5. 120
  6. 58
  7. 22
  8. 11111
  9. 7800
  10. 36
  11. 14
  12. 100
  13. 21
  14. 2
  15. 51
  16. 15
  17. 26
  18. 18
  19. 90
  20. 21
  21. 164
  22. 15000
  23. 1111
  24. 72
  25. 0
  26. 2701
  27. 100
  28. 49
  29. Monday
  30. 3003
  31. 190
  32. Thursday
  33. 2
  34. 27
  35. 81
  36. 777777777
  37. 80
  38. Saturday
  39. 2278
  40. 1

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