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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 311 · 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. 1.396 + 693 =
  2. 2.13 × 4 =
  3. 3.1 + 2 + 3 + … + 80 =
  4. 4.37 × 27 =
  5. 5.9 × 2 = ?8 — what is the missing digit?
  6. 6.9 × 3 =
  7. 7.1 + 2 + 3 + … + 8 =
  8. 8.Take 46 and take away the sum of its digits. What do you get?
  9. 9.I thought of a number, multiplied it by 2 and added 8. I got 22. What was my number?
  10. 10.1 + 3 + 5 + … + 21 =
  11. 11.12345679 × 63 =
  12. 12.3 × 9 =
  13. 13.Magic square (every row, column and diagonal has the same total): 11 18 13 | 16 14 12 | 15 ? 17. What is the missing number?
  14. 14.Half of 134 =
  15. 15.Magic square (every row, column and diagonal has the same total): 24 ? 12 | 3 15 27 | 18 21 6. What is the missing number?
  16. 16.I thought of a number, multiplied it by 2 and added 1. I got 17. What was my number?
  17. 17.1 + 2 + 3 + … + 92 =
  18. 18.34 × 4 =
  19. 19.1 + 2 + 3 + … + 66 =
  20. 20.12345 × 9 + 6 =
  21. 21.Magic square (every row, column and diagonal has the same total): ? 12 14 | 8 16 24 | 18 20 10. What is the missing number?
  22. 22.A girl is 7 years old and her brother is 2 years older. How old will her brother be in 4 years?
  23. 23.9 × 7 = ?3 — what is the missing digit?
  24. 24.9 × 8 =
  25. 25.1 + 2 + 3 + … + 62 =
  26. 26.6 × 9 =
  27. 27.What comes next? 14, 20, 26, 32, ? (a) 44 (b) 32 (c) 39 (d) 38
  28. 28.Think of 5. Multiply it by 3, then add 5. What number do you end with?
  29. 29.Take 780. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  30. 30.3?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.Take 22 and take away the sum of its digits. What do you get?
  32. 32.Magic trick! Think of 7. Double it, add 14, halve it, then take away 7. What number do you get?
  33. 33.9 × 4 = ?6 — what is the missing digit?
  34. 34.9 × 3 = 2? — what is the missing digit?
  35. 35.The 5th of a month is a Friday. What day is the 27th of the same month? (a) Tuesday (b) Saturday (c) Friday (d) Sunday
  36. 36.A girl is 5 years old and her brother is 4 years older. How old will her brother be in 3 years?
  37. 37.If today is Tuesday, what day was it 22 days ago? (a) Thursday (b) Sunday (c) Tuesday (d) Monday
  38. 38.Magic trick! Think of 17. Double it, add 18, halve it, then take away 17. What number do you get?
  39. 39.778 × 10 =
  40. 40.Take 73 and take away the sum of its digits. What do you get?

Answer key

  1. 1089
  2. 52
  3. 3240
  4. 999
  5. 1
  6. 27
  7. 36
  8. 36
  9. 7
  10. 121
  11. 777777777
  12. 27
  13. 10
  14. 67
  15. 9
  16. 8
  17. 4278
  18. 136
  19. 2211
  20. 111111
  21. 22
  22. 13
  23. 6
  24. 72
  25. 1953
  26. 54
  27. 38
  28. 20
  29. 693
  30. 2
  31. 18
  32. 7
  33. 3
  34. 7
  35. Saturday
  36. 12
  37. Monday
  38. 9
  39. 7780
  40. 63

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