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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 12 · 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 Saturday, what day will it be after 42 days? (a) Sunday (b) Friday (c) Saturday (d) Tuesday
  2. 2.Magic square (every row, column and diagonal has the same total): 19 9 23 | ? 17 13 | 11 25 15. What is the missing number?
  3. 3.Half of 62 =
  4. 4.46 × 4 =
  5. 5.9 × 5 = 4? — what is the missing digit?
  6. 6.9 × 8 = 7? — what is the missing digit?
  7. 7.33 × 4 =
  8. 8.506 × 10 =
  9. 9.11 × ? = 11000
  10. 10.1 + 2 + 3 + … + 62 =
  11. 11.9 × 7 = ?3 — what is the missing digit?
  12. 12.9 × 3 = ?7 — what is the missing digit?
  13. 13.Double 72 =
  14. 14.If today is Sunday, what day will it be after 70 days? (a) Sunday (b) Saturday (c) Wednesday (d) Monday
  15. 15.I thought of a number, multiplied it by 3 and added 3. I got 18. What was my number?
  16. 16.Take 38 and take away the sum of its digits. What do you get?
  17. 17.6 × 100 =
  18. 18.A father is 38 years old and his son is 12. How old was the father when the son was born?
  19. 19.Do the 1089 trick with 612: reverse and subtract, then reverse that answer and add. What do you get?
  20. 20.9 × 10 =
  21. 21.Magic square (every row, column and diagonal has the same total): 12 27 24 | ? 21 9 | 18 15 30. What is the missing number?
  22. 22.19 × 4 =
  23. 23.9 × 10 = 9? — what is the missing digit?
  24. 24.Magic square (every row, column and diagonal has the same total): 12 27 ? | 33 21 9 | 18 15 30. What is the missing number?
  25. 25.If today is Sunday, what day will it be after 50 days? (a) Tuesday (b) Thursday (c) Monday (d) Sunday
  26. 26.9 × 2 = ?8 — what is the missing digit?
  27. 27.9 × 8 = ?2 — what is the missing digit?
  28. 28.9 × 2 =
  29. 29.12345679 × 18 =
  30. 30.12345679 × 81 =
  31. 31.872? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.Magic square (every row, column and diagonal has the same total): 20 17 32 | 35 23 ? | 14 29 26. What is the missing number?
  33. 33.The 3rd of a month is a Monday. What day is the 13th of the same month? (a) Sunday (b) Thursday (c) Friday (d) Wednesday
  34. 34.17 × 4 =
  35. 35.1 + 2 + 3 + … + 66 =
  36. 36.A piggy bank has 9 coins of ₹5 and 10 coins of ₹2. How many rupees are in it?
  37. 37.9 × 7 =
  38. 38.7 × 9 =
  39. 39.9 × 6 =
  40. 40.9 × 9 = ?1 — what is the missing digit?

Answer key

  1. Saturday
  2. 21
  3. 31
  4. 184
  5. 5
  6. 2
  7. 132
  8. 5060
  9. 1000
  10. 1953
  11. 6
  12. 2
  13. 144
  14. Sunday
  15. 5
  16. 27
  17. 600
  18. 26
  19. 1089
  20. 90
  21. 33
  22. 76
  23. 0
  24. 24
  25. Monday
  26. 1
  27. 7
  28. 18
  29. 222222222
  30. 999999999
  31. 1
  32. 11
  33. Thursday
  34. 68
  35. 2211
  36. 65
  37. 63
  38. 63
  39. 54
  40. 8

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