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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 8 · 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.If today is Monday, what day was it 17 days ago? (a) Saturday (b) Friday (c) Thursday (d) Monday
  2. 2.11111 × 11111 =
  3. 3.What comes next? 20, 24, 28, 32, ? (a) 32 (b) 40 (c) 37 (d) 36
  4. 4.Double 91 =
  5. 5.Take 900. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  6. 6.Double 16 =
  7. 7.7?20 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.I thought of a number, added 6 and then doubled it. I got 18. What was my number?
  9. 9.Magic square (every row, column and diagonal has the same total): 17 14 ? | 32 20 8 | 11 26 23. What is the missing number?
  10. 10.What comes next? 15, 22, 29, 36, ? (a) 43 (b) 44 (c) 36 (d) 50
  11. 11.37 × 3 =
  12. 12.What comes next? 3, 6, 12, 24, ? (a) 36 (b) 49 (c) 42 (d) 48
  13. 13.9 × 10 = ?0 — what is the missing digit?
  14. 14.83? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.Magic square (every row, column and diagonal has the same total): 13 34 19 | ? 22 16 | 25 10 31. What is the missing number?
  16. 16.1 + 3 + 5 + … + 31 =
  17. 17.8 × 9 =
  18. 18.If today is Sunday, what day will it be after 24 days? (a) Saturday (b) Wednesday (c) Tuesday (d) Thursday
  19. 19.Think of 15. Multiply it by 5, then add 9. What number do you end with?
  20. 20.The ages of two twins add up to 18. How old is each twin?
  21. 21.123456 × 8 + 6 =
  22. 22.12345679 × 18 =
  23. 23.Take 29 and take away the sum of its digits. What do you get?
  24. 24.9 × 8 = ?2 — what is the missing digit?
  25. 25.299 × ? = 2990
  26. 26.Double 71 =
  27. 27.Do the 1089 trick with 117: reverse and subtract, then reverse that answer and add. What do you get?
  28. 28.I thought of a number, added 9 and then doubled it. I got 38. What was my number?
  29. 29.What comes next? 2, 4, 8, 16, ? (a) 32 (b) 24 (c) 33 (d) 28
  30. 30.693 + 396 =
  31. 31.If today is Sunday, what day will it be after 80 days? (a) Thursday (b) Tuesday (c) Wednesday (d) Saturday
  32. 32.The 2nd of a month is a Tuesday. What day is the 13th of the same month? (a) Friday (b) Tuesday (c) Sunday (d) Saturday
  33. 33.1 + 2 + 3 + … + 46 =
  34. 34.12 × 4 =
  35. 35.What comes next? 7, 16, 25, 34, ? (a) 44 (b) 34 (c) 43 (d) 52
  36. 36.1 × 9 =
  37. 37.Take 56 and take away the sum of its digits. What do you get?
  38. 38.889 × 10 =
  39. 39.Magic trick! Think of 16. Double it, add 8, halve it, then take away 16. What number do you get?
  40. 40.I thought of a number, multiplied it by 5 and added 5. I got 35. What was my number?

Answer key

  1. Friday
  2. 123454321
  3. 36
  4. 182
  5. 891
  6. 32
  7. 9
  8. 3
  9. 29
  10. 43
  11. 111
  12. 48
  13. 9
  14. 7
  15. 28
  16. 256
  17. 72
  18. Wednesday
  19. 84
  20. 9
  21. 987654
  22. 222222222
  23. 18
  24. 7
  25. 10
  26. 142
  27. 1089
  28. 10
  29. 32
  30. 1089
  31. Wednesday
  32. Saturday
  33. 1081
  34. 48
  35. 43
  36. 9
  37. 45
  38. 8890
  39. 4
  40. 6

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