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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 408 · 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.Magic square (every row, column and diagonal has the same total): 25 ? 21 | 15 19 23 | 17 27 13. What is the missing number?
  2. 2.If today is Wednesday, what day was it 16 days ago? (a) Thursday (b) Sunday (c) Tuesday (d) Monday
  3. 3.1 + 3 + 5 + … + 9 =
  4. 4.9 × 10 = 9? — what is the missing digit?
  5. 5.7 × 9 =
  6. 6.9 × 5 = 4? — what is the missing digit?
  7. 7.If today is Saturday, what day will it be after 57 days? (a) Monday (b) Saturday (c) Sunday (d) Wednesday
  8. 8.9 × 4 = 3? — what is the missing digit?
  9. 9.Do the 1089 trick with 982: reverse and subtract, then reverse that answer and add. What do you get?
  10. 10.A father is 36 years old and his son is 9. How old was the father when the son was born?
  11. 11.Magic square (every row, column and diagonal has the same total): ? 23 13 | 11 19 27 | 25 15 17. What is the missing number?
  12. 12.9 × 3 =
  13. 13.Take 518. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  14. 14.Magic trick! Think of 3. Double it, add 6, halve it, then take away 3. What number do you get?
  15. 15.10 × 9 =
  16. 16.563 × ? = 5630
  17. 17.891 + 198 =
  18. 18.12345679 × 72 =
  19. 19.Think of 9. Multiply it by 2, then add 2. What number do you end with?
  20. 20.Magic square (every row, column and diagonal has the same total): 9 ? 5 | 7 11 15 | 17 3 13. What is the missing number?
  21. 21.Take 64 and take away the sum of its digits. What do you get?
  22. 22.57 × ? = 5700
  23. 23.15 × 4 =
  24. 24.Magic trick! Think of 13. Double it, add 6, halve it, then take away 13. What number do you get?
  25. 25.123456789 × 8 + 9 =
  26. 26.Magic square (every row, column and diagonal has the same total): 10 5 12 | 11 ? 7 | 6 13 8. What is the missing number?
  27. 27.The 2nd of a month is a Tuesday. What day is the 13th of the same month? (a) Saturday (b) Friday (c) Sunday (d) Tuesday
  28. 28.54 × ? = 5400
  29. 29.43 × ? = 4300
  30. 30.Take 65 and take away the sum of its digits. What do you get?
  31. 31.A piggy bank has 10 coins of ₹5 and 2 coins of ₹2. How many rupees are in it?
  32. 32.Odd one out: which number is NOT in the 6 times table? (a) 12 (b) 39 (c) 42 (d) 30
  33. 33.33 × 4 =
  34. 34.Take 89 and take away the sum of its digits. What do you get?
  35. 35.41 × 4 =
  36. 36.If today is Tuesday, what day will it be after 36 days? (a) Tuesday (b) Thursday (c) Saturday (d) Wednesday
  37. 37.287 × 10 =
  38. 38.9 × 8 =
  39. 39.1 + 2 + 3 + … + 27 =
  40. 40.If today is Friday, what day will it be after 69 days? (a) Friday (b) Wednesday (c) Thursday (d) Sunday

Answer key

  1. 11
  2. Monday
  3. 25
  4. 0
  5. 63
  6. 5
  7. Sunday
  8. 6
  9. 1089
  10. 27
  11. 21
  12. 27
  13. 297
  14. 3
  15. 90
  16. 10
  17. 1089
  18. 888888888
  19. 20
  20. 19
  21. 54
  22. 100
  23. 60
  24. 3
  25. 987654321
  26. 9
  27. Saturday
  28. 100
  29. 100
  30. 54
  31. 54
  32. 39
  33. 132
  34. 72
  35. 164
  36. Wednesday
  37. 2870
  38. 72
  39. 378
  40. Thursday

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