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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 32 · 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. 1.10 × 9 =
  2. 2.Take 24 and take away the sum of its digits. What do you get?
  3. 3.What comes next? 3, 6, 12, 24, ? (a) 42 (b) 36 (c) 49 (d) 48
  4. 4.A father is 38 years old and his son is 11. How old was the father when the son was born?
  5. 5.Half of 12 =
  6. 6.Magic square (every row, column and diagonal has the same total): 30 15 18 | 9 ? 33 | 24 27 12. What is the missing number?
  7. 7.?699 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, multiplied it by 3 and added 2. I got 29. What was my number?
  9. 9.If today is Thursday, what day was it 56 days ago? (a) Wednesday (b) Friday (c) Sunday (d) Thursday
  10. 10.What comes next? 13, 21, 29, 37, ? (a) 37 (b) 53 (c) 45 (d) 46
  11. 11.I thought of a number, added 8 and then doubled it. I got 22. What was my number?
  12. 12.1 + 2 + 3 + … + 47 =
  13. 13.12345679 × 27 =
  14. 14.?206 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.If today is Wednesday, what day will it be after 26 days? (a) Monday (b) Thursday (c) Sunday (d) Tuesday
  16. 16.Magic square (every row, column and diagonal has the same total): 15 ? 23 | 25 17 9 | 11 21 19. What is the missing number?
  17. 17.The ages of two twins add up to 8. How old is each twin?
  18. 18.What comes next? 25, 36, 49, 64, ? (a) 79 (b) 82 (c) 83 (d) 81
  19. 19.1234567 × 9 + 8 =
  20. 20.Odd one out: which number is NOT in the 6 times table? (a) 18 (b) 36 (c) 39 (d) 30
  21. 21.?191 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.Take 37 and take away the sum of its digits. What do you get?
  23. 23.If today is Monday, what day was it 45 days ago? (a) Thursday (b) Friday (c) Saturday (d) Monday
  24. 24.In the 1089 trick, the subtraction gave a 3-digit number that starts with 7. What is that number?
  25. 25.If today is Wednesday, what day was it 33 days ago? (a) Thursday (b) Saturday (c) Friday (d) Monday
  26. 26.Take 46 and take away the sum of its digits. What do you get?
  27. 27.685 × 10 =
  28. 28.297 + 792 =
  29. 29.Magic square (every row, column and diagonal has the same total): 24 27 12 | ? 21 33 | 30 15 18. What is the missing number?
  30. 30.37 × 21 =
  31. 31.19 × 4 =
  32. 32.759? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.Do the 1089 trick with 416: reverse and subtract, then reverse that answer and add. What do you get?
  34. 34.Double 17 =
  35. 35.9 × 10 = 9? — what is the missing digit?
  36. 36.What comes next? 18, 23, 28, 33, ? (a) 43 (b) 39 (c) 33 (d) 38
  37. 37.Magic square (every row, column and diagonal has the same total): 14 12 22 | 24 ? 8 | 10 20 18. What is the missing number?
  38. 38.37 × 9 =
  39. 39.Take 25 and take away the sum of its digits. What do you get?
  40. 40.I thought of a number, multiplied it by 2 and added 7. I got 29. What was my number?

Answer key

  1. 90
  2. 18
  3. 48
  4. 27
  5. 6
  6. 21
  7. 3
  8. 9
  9. Thursday
  10. 45
  11. 3
  12. 1128
  13. 333333333
  14. 1
  15. Monday
  16. 13
  17. 4
  18. 81
  19. 11111111
  20. 39
  21. 7
  22. 27
  23. Friday
  24. 792
  25. Friday
  26. 36
  27. 6850
  28. 1089
  29. 9
  30. 777
  31. 76
  32. 6
  33. 1089
  34. 34
  35. 0
  36. 38
  37. 16
  38. 333
  39. 18
  40. 11

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