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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 737 · 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.What comes next? 5, 10, 20, 40, ? (a) 70 (b) 81 (c) 60 (d) 80
  2. 2.12345679 × 72 =
  3. 3.1 + 2 + 3 + … + 16 =
  4. 4.12 × 4 =
  5. 5.37 × 6 =
  6. 6.37 × 27 =
  7. 7.I thought of a number, added 5 and then doubled it. I got 28. What was my number?
  8. 8.What comes next? 9, 16, 25, 36, ? (a) 49 (b) 47 (c) 51 (d) 50
  9. 9.If today is Tuesday, what day was it 53 days ago? (a) Friday (b) Saturday (c) Monday (d) Thursday
  10. 10.1 + 2 + 3 + … + 44 =
  11. 11.Half of 156 =
  12. 12.186? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.51 × 4 =
  14. 14.Magic trick! Think of 12. Double it, add 4, halve it, then take away 12. What number do you get?
  15. 15.Do the 1089 trick with 518: reverse and subtract, then reverse that answer and add. What do you get?
  16. 16.111 × 111 =
  17. 17.24 × 4 =
  18. 18.8 × 4 =
  19. 19.Double 39 =
  20. 20.Magic square (every row, column and diagonal has the same total): 12 11 ? | 17 13 9 | 10 15 14. What is the missing number?
  21. 21.1 + 2 + 3 + … + 68 =
  22. 22.A girl is 6 years old and her brother is 2 years older. How old will her brother be in 7 years?
  23. 23.Half of 68 =
  24. 24.Half of 174 =
  25. 25.9 × 6 =
  26. 26.If today is Tuesday, what day will it be after 75 days? (a) Saturday (b) Wednesday (c) Sunday (d) Monday
  27. 27.1 + 2 + 3 + … + 75 =
  28. 28.Think of 4. Multiply it by 2, then add 9. What number do you end with?
  29. 29.120? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.1 + 2 + 3 + … + 96 =
  31. 31.6 × 100 =
  32. 32.9 × 9 =
  33. 33.836? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.Magic trick! Think of 13. Double it, add 8, halve it, then take away 13. What number do you get?
  35. 35.36 × 4 =
  36. 36.1 + 2 + 3 + … + 41 =
  37. 37.A girl is 10 years old and her brother is 2 years older. How old will her brother be in 2 years?
  38. 38.4 × 9 =
  39. 39.891 + 198 =
  40. 40.Magic square (every row, column and diagonal has the same total): 14 ? 22 | 24 16 8 | 10 20 18. What is the missing number?

Answer key

  1. 80
  2. 888888888
  3. 136
  4. 48
  5. 222
  6. 999
  7. 9
  8. 49
  9. Friday
  10. 990
  11. 78
  12. 3
  13. 204
  14. 2
  15. 1089
  16. 12321
  17. 96
  18. 32
  19. 78
  20. 16
  21. 2346
  22. 15
  23. 34
  24. 87
  25. 54
  26. Sunday
  27. 2850
  28. 17
  29. 6
  30. 4656
  31. 600
  32. 81
  33. 1
  34. 4
  35. 144
  36. 861
  37. 14
  38. 36
  39. 1089
  40. 12

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