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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 675 · 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. 1.9 × 8 =
  2. 2.7 × 9 =
  3. 3.If today is Friday, what day will it be after 17 days? (a) Tuesday (b) Thursday (c) Sunday (d) Monday
  4. 4.?796 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.Half of 34 =
  6. 6.A father is 40 years old and his son is 5. How old was the father when the son was born?
  7. 7.15 × 4 =
  8. 8.9 × 8 = ?2 — what is the missing digit?
  9. 9.Magic square (every row, column and diagonal has the same total): 8 7 12 | 13 9 ? | 6 11 10. What is the missing number?
  10. 10.891 + 198 =
  11. 11.4 × 9 =
  12. 12.43 × 4 =
  13. 13.4?63 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.What comes next? 1, 2, 4, 8, ? (a) 12 (b) 17 (c) 14 (d) 16
  15. 15.9 × 6 =
  16. 16.Take 210. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  17. 17.Take 920. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  18. 18.9 × 3 =
  19. 19.Take 86 and take away the sum of its digits. What do you get?
  20. 20.Magic trick! Think of 6. Double it, add 16, halve it, then take away 6. What number do you get?
  21. 21.The 8th of a month is a Monday. What day is the 18th of the same month? (a) Friday (b) Sunday (c) Wednesday (d) Thursday
  22. 22.Magic square (every row, column and diagonal has the same total): 14 16 6 | 4 12 20 | 18 ? 10. What is the missing number?
  23. 23.9 × 7 = 6? — what is the missing digit?
  24. 24.The ages of two twins add up to 8. How old is each twin?
  25. 25.The ages of two twins add up to 16. How old is each twin?
  26. 26.A girl is 10 years old and her brother is 3 years older. How old will her brother be in 7 years?
  27. 27.1234 × 9 + 5 =
  28. 28.82 × ? = 8200
  29. 29.7 × 4 =
  30. 30.Double 81 =
  31. 31.If today is Wednesday, what day will it be after 78 days? (a) Thursday (b) Friday (c) Wednesday (d) Sunday
  32. 32.Magic square (every row, column and diagonal has the same total): 6 20 10 | 16 ? 8 | 14 4 18. What is the missing number?
  33. 33.21 × 4 =
  34. 34.Magic square (every row, column and diagonal has the same total): 24 ? 18 | 9 15 21 | 12 27 6. What is the missing number?
  35. 35.594 + 495 =
  36. 36.I thought of a number, multiplied it by 5 and added 2. I got 17. What was my number?
  37. 37.1 + 3 + 5 + … + 35 =
  38. 38.Magic square (every row, column and diagonal has the same total): 10 31 16 | 25 ? 13 | 22 7 28. What is the missing number?
  39. 39.?852 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.Magic square (every row, column and diagonal has the same total): 11 16 9 | ? 12 14 | 15 8 13. What is the missing number?

Answer key

  1. 72
  2. 63
  3. Monday
  4. 5
  5. 17
  6. 35
  7. 60
  8. 7
  9. 5
  10. 1089
  11. 36
  12. 172
  13. 5
  14. 16
  15. 54
  16. 198
  17. 891
  18. 27
  19. 72
  20. 8
  21. Thursday
  22. 8
  23. 3
  24. 4
  25. 8
  26. 20
  27. 11111
  28. 100
  29. 28
  30. 162
  31. Thursday
  32. 12
  33. 84
  34. 3
  35. 1089
  36. 3
  37. 324
  38. 19
  39. 3
  40. 10

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