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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 300 · 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.Double 12 =
  2. 2.9 × 8 = ?2 — what is the missing digit?
  3. 3.Magic square (every row, column and diagonal has the same total): 11 4 ? | 6 8 10 | 7 12 5. What is the missing number?
  4. 4.Half of 76 =
  5. 5.Magic square (every row, column and diagonal has the same total): 3 8 ? | 10 6 2 | 5 4 9. What is the missing number?
  6. 6.10 × 9 =
  7. 7.7 × 100 =
  8. 8.Magic trick! Think of 6. Double it, add 10, halve it, then take away 6. What number do you get?
  9. 9.48 × ? = 4800
  10. 10.Magic square (every row, column and diagonal has the same total): 8 6 16 | 18 10 2 | ? 14 12. What is the missing number?
  11. 11.Magic square (every row, column and diagonal has the same total): 20 6 16 | 10 14 18 | ? 22 8. What is the missing number?
  12. 12.6 × 9 =
  13. 13.49 × 4 =
  14. 14.9 × 2 =
  15. 15.19 × 4 =
  16. 16.What comes next? 9, 16, 25, 36, ? (a) 50 (b) 51 (c) 47 (d) 49
  17. 17.A father is 44 years old and his son is 5. How old was the father when the son was born?
  18. 18.1111 × 1111 =
  19. 19.22 × 1000 =
  20. 20.Magic square (every row, column and diagonal has the same total): 17 3 13 | 7 11 ? | 9 19 5. What is the missing number?
  21. 21.8?11 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.What comes next? 1, 4, 9, 16, ? (a) 23 (b) 27 (c) 25 (d) 26
  23. 23.1234 × 8 + 4 =
  24. 24.447 × ? = 4470
  25. 25.Take 25 and take away the sum of its digits. What do you get?
  26. 26.If today is Saturday, what day will it be after 31 days? (a) Wednesday (b) Tuesday (c) Friday (d) Monday
  27. 27.A girl is 11 years old and her brother is 3 years older. How old will her brother be in 3 years?
  28. 28.31?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.1 + 2 + 3 + … + 77 =
  30. 30.Magic square (every row, column and diagonal has the same total): 5 ? 9 | 15 11 7 | 13 3 17. What is the missing number?
  31. 31.51 × 4 =
  32. 32.41 × 4 =
  33. 33.9 × 7 = 6? — what is the missing digit?
  34. 34.Think of 7. Multiply it by 2, then add 9. What number do you end with?
  35. 35.If today is Sunday, what day will it be after 68 days? (a) Thursday (b) Saturday (c) Monday (d) Friday
  36. 36.1 + 2 + 3 + … + 63 =
  37. 37.Magic square (every row, column and diagonal has the same total): 9 14 7 | 8 10 ? | 13 6 11. What is the missing number?
  38. 38.A girl is 8 years old and her brother is 5 years older. How old will her brother be in 2 years?
  39. 39.If today is Friday, what day was it 50 days ago? (a) Sunday (b) Friday (c) Wednesday (d) Thursday
  40. 40.7 × 9 =

Answer key

  1. 24
  2. 7
  3. 9
  4. 38
  5. 7
  6. 90
  7. 700
  8. 5
  9. 100
  10. 4
  11. 12
  12. 54
  13. 196
  14. 18
  15. 76
  16. 49
  17. 39
  18. 1234321
  19. 22000
  20. 15
  21. 8
  22. 25
  23. 9876
  24. 10
  25. 18
  26. Tuesday
  27. 17
  28. 8
  29. 3003
  30. 19
  31. 204
  32. 164
  33. 3
  34. 23
  35. Friday
  36. 2016
  37. 12
  38. 15
  39. Thursday
  40. 63

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