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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 264 · 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.Think of 7. Multiply it by 2, then add 6. What number do you end with?
  2. 2.Take 59 and take away the sum of its digits. What do you get?
  3. 3.Think of 11. Multiply it by 2, then add 5. What number do you end with?
  4. 4.44 × 1000 =
  5. 5.If today is Monday, what day was it 18 days ago? (a) Thursday (b) Wednesday (c) Friday (d) Sunday
  6. 6.Double 65 =
  7. 7.What comes next? 9, 16, 25, 36, ? (a) 50 (b) 49 (c) 51 (d) 47
  8. 8.Magic trick! Think of 12. Double it, add 4, halve it, then take away 12. What number do you get?
  9. 9.?511 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.The 4th of a month is a Saturday. What day is the 18th of the same month? (a) Saturday (b) Tuesday (c) Sunday (d) Friday
  11. 11.4?04 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.12345 × 8 + 5 =
  13. 13.1 + 3 + 5 + … + 15 =
  14. 14.43 × 4 =
  15. 15.51?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.2 × 9 =
  17. 17.9 × 3 = 2? — what is the missing digit?
  18. 18.9 × 2 =
  19. 19.If today is Monday, what day was it 21 days ago? (a) Tuesday (b) Monday (c) Thursday (d) Sunday
  20. 20.Think of 12. Multiply it by 5, then add 4. What number do you end with?
  21. 21.The 2nd of a month is a Friday. What day is the 28th of the same month? (a) Wednesday (b) Tuesday (c) Thursday (d) Saturday
  22. 22.19 × 1000 =
  23. 23.Magic trick! Think of 3. Double it, add 18, halve it, then take away 3. What number do you get?
  24. 24.Half of 182 =
  25. 25.9 × 10 =
  26. 26.Magic square (every row, column and diagonal has the same total): 8 13 6 | 7 9 11 | 12 ? 10. What is the missing number?
  27. 27.Take 389. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  28. 28.12 × 4 =
  29. 29.Magic square (every row, column and diagonal has the same total): 17 14 29 | ? 20 8 | 11 26 23. What is the missing number?
  30. 30.Take 21 and take away the sum of its digits. What do you get?
  31. 31.What comes next? 5, 10, 20, 40, ? (a) 70 (b) 81 (c) 60 (d) 80
  32. 32.Take 30 and take away the sum of its digits. What do you get?
  33. 33.1234 × 9 + 5 =
  34. 34.1 + 2 + 3 + … + 9 =
  35. 35.9 × 2 = ?8 — what is the missing digit?
  36. 36.4 × 9 =
  37. 37.12345679 × 72 =
  38. 38.Half of 144 =
  39. 39.46 × 4 =
  40. 40.What comes next? 14, 17, 20, 23, ? (a) 26 (b) 27 (c) 23 (d) 29

Answer key

  1. 20
  2. 45
  3. 27
  4. 44000
  5. Thursday
  6. 130
  7. 49
  8. 2
  9. 2
  10. Saturday
  11. 1
  12. 98765
  13. 64
  14. 172
  15. 9
  16. 18
  17. 7
  18. 18
  19. Monday
  20. 64
  21. Wednesday
  22. 19000
  23. 9
  24. 91
  25. 90
  26. 5
  27. 594
  28. 48
  29. 32
  30. 18
  31. 80
  32. 27
  33. 11111
  34. 45
  35. 1
  36. 36
  37. 888888888
  38. 72
  39. 184
  40. 26

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