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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 718 · 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 × 5 = 4? — what is the missing digit?
  2. 2.Magic trick! Think of 2. Double it, add 14, halve it, then take away 2. What number do you get?
  3. 3.Think of 4. Multiply it by 2, then add 2. What number do you end with?
  4. 4.A girl is 9 years old and her brother is 3 years older. How old will her brother be in 7 years?
  5. 5.Double 61 =
  6. 6.29 × 4 =
  7. 7.9 × 2 = ?8 — what is the missing digit?
  8. 8.396 + 693 =
  9. 9.9 × 2 = 1? — what is the missing digit?
  10. 10.The 5th of a month is a Friday. What day is the 16th of the same month? (a) Monday (b) Wednesday (c) Friday (d) Tuesday
  11. 11.What comes next? 5, 10, 20, 40, ? (a) 70 (b) 60 (c) 81 (d) 80
  12. 12.Half of 138 =
  13. 13.The ages of two twins add up to 16. How old is each twin?
  14. 14.Magic square (every row, column and diagonal has the same total): 23 13 15 | 9 ? 25 | 19 21 11. What is the missing number?
  15. 15.9 × 6 = ?4 — what is the missing digit?
  16. 16.88 × 100 =
  17. 17.24 × 4 =
  18. 18.Magic square (every row, column and diagonal has the same total): 27 ? 15 | 6 18 30 | 21 24 9. What is the missing number?
  19. 19.Magic trick! Think of 3. Double it, add 6, halve it, then take away 3. What number do you get?
  20. 20.30 × 4 =
  21. 21.Double 51 =
  22. 22.If today is Monday, what day will it be after 83 days? (a) Monday (b) Saturday (c) Sunday (d) Wednesday
  23. 23.1 + 2 + 3 + … + 6 =
  24. 24.91 × 100 =
  25. 25.1 + 2 + 3 + … + 42 =
  26. 26.9 × 9 = 8? — what is the missing digit?
  27. 27.4 × ? = 4000
  28. 28.Double 38 =
  29. 29.1234 × 9 + 5 =
  30. 30.28 × 4 =
  31. 31.Do the 1089 trick with 990: reverse and subtract, then reverse that answer and add. What do you get?
  32. 32.37 × 15 =
  33. 33.9 × 8 = 7? — what is the missing digit?
  34. 34.10 × 9 =
  35. 35.111 × 111 =
  36. 36.54?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.12 × 8 + 2 =
  38. 38.8 × 9 =
  39. 39.If today is Saturday, what day will it be after 69 days? (a) Monday (b) Thursday (c) Friday (d) Saturday
  40. 40.470 × 10 =

Answer key

  1. 5
  2. 7
  3. 10
  4. 19
  5. 122
  6. 116
  7. 1
  8. 1089
  9. 8
  10. Tuesday
  11. 80
  12. 69
  13. 8
  14. 17
  15. 5
  16. 8800
  17. 96
  18. 12
  19. 3
  20. 120
  21. 102
  22. Sunday
  23. 21
  24. 9100
  25. 903
  26. 1
  27. 1000
  28. 76
  29. 11111
  30. 112
  31. 1089
  32. 555
  33. 2
  34. 90
  35. 12321
  36. 6
  37. 98
  38. 72
  39. Friday
  40. 4700

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