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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 393 · 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 will it be after 59 days? (a) Friday (b) Thursday (c) Sunday (d) Wednesday
  2. 2.12345678 × 8 + 8 =
  3. 3.9 × 9 = ?1 — what is the missing digit?
  4. 4.98? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.111 × 111 =
  6. 6.306 × 10 =
  7. 7.9 × 2 =
  8. 8.Double 11 =
  9. 9.12345679 × 72 =
  10. 10.If today is Thursday, what day will it be after 67 days? (a) Sunday (b) Thursday (c) Monday (d) Tuesday
  11. 11.A father is 38 years old and his son is 11. How old was the father when the son was born?
  12. 12.Magic trick! Think of 9. Double it, add 16, halve it, then take away 9. What number do you get?
  13. 13.9 × 10 =
  14. 14.9 × 9 = 8? — what is the missing digit?
  15. 15.1 + 2 + 3 + … + 27 =
  16. 16.14 × 4 =
  17. 17.17 × 4 =
  18. 18.1 × 9 =
  19. 19.6 × 4 =
  20. 20.Magic square (every row, column and diagonal has the same total): ? 7 6 | 9 5 1 | 4 3 8. What is the missing number?
  21. 21.60 × 4 =
  22. 22.I thought of a number, added 3 and then doubled it. I got 34. What was my number?
  23. 23.The ages of two twins add up to 10. How old is each twin?
  24. 24.1 + 2 + 3 + … + 69 =
  25. 25.9 × 6 = 5? — what is the missing digit?
  26. 26.8 × 4 =
  27. 27.What comes next? 3, 6, 12, 24, ? (a) 49 (b) 42 (c) 48 (d) 36
  28. 28.1 + 2 + 3 + … + 59 =
  29. 29.9 × 8 =
  30. 30.8 × 9 =
  31. 31.9 × 9 =
  32. 32.I thought of a number, multiplied it by 2 and added 7. I got 21. What was my number?
  33. 33.Magic square (every row, column and diagonal has the same total): 11 21 19 | ? 17 9 | 15 13 23. What is the missing number?
  34. 34.What comes next? 14, 17, 20, 23, ? (a) 29 (b) 23 (c) 27 (d) 26
  35. 35.77?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.7 × 4 =
  37. 37.1 + 2 + 3 + … + 53 =
  38. 38.Half of 106 =
  39. 39.111111 × 111111 =
  40. 40.396 + 693 =

Answer key

  1. Thursday
  2. 98765432
  3. 8
  4. 1
  5. 12321
  6. 3060
  7. 18
  8. 22
  9. 888888888
  10. Monday
  11. 27
  12. 8
  13. 90
  14. 1
  15. 378
  16. 56
  17. 68
  18. 9
  19. 24
  20. 2
  21. 240
  22. 14
  23. 5
  24. 2415
  25. 4
  26. 32
  27. 48
  28. 1770
  29. 72
  30. 72
  31. 81
  32. 7
  33. 25
  34. 26
  35. 4
  36. 28
  37. 1431
  38. 53
  39. 12345654321
  40. 1089

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