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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 81 · 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 trick! Think of 13. Double it, add 6, halve it, then take away 13. What number do you get?
  2. 2.Take 990. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  3. 3.21 × 4 =
  4. 4.Magic square (every row, column and diagonal has the same total): 14 15 ? | 9 13 17 | 16 11 12. What is the missing number?
  5. 5.42 × 4 =
  6. 6.40?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.123456 × 9 + 7 =
  8. 8.37 × 6 =
  9. 9.Take 880. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  10. 10.A father is 42 years old and his son is 8. How old was the father when the son was born?
  11. 11.41 × ? = 41000
  12. 12.Half of 182 =
  13. 13.I thought of a number, multiplied it by 3 and added 1. I got 43. What was my number?
  14. 14.You have 12 coins. Each coin is ₹1 or ₹2, and together they make ₹19. How many ₹2 coins do you have?
  15. 15.891 + 198 =
  16. 16.Magic square (every row, column and diagonal has the same total): 16 31 10 | 13 19 ? | 28 7 22. What is the missing number?
  17. 17.5 × 9 =
  18. 18.11111 × 11111 =
  19. 19.9 × 5 = 4? — what is the missing digit?
  20. 20.I thought of a number, multiplied it by 5 and added 8. I got 43. What was my number?
  21. 21.What comes next? 9, 16, 25, 36, ? (a) 51 (b) 50 (c) 47 (d) 49
  22. 22.1 + 3 + 5 + … + 13 =
  23. 23.I thought of a number, multiplied it by 5 and added 8. I got 23. What was my number?
  24. 24.1 + 2 + 3 + … + 58 =
  25. 25.9 × 2 = 1? — what is the missing digit?
  26. 26.Magic square (every row, column and diagonal has the same total): 14 16 ? | 4 12 20 | 18 8 10. What is the missing number?
  27. 27.If today is Thursday, what day was it 30 days ago? (a) Monday (b) Wednesday (c) Friday (d) Tuesday
  28. 28.12345679 × 81 =
  29. 29.9 × 9 = 8? — what is the missing digit?
  30. 30.A father is 36 years old and his son is 12. How old was the father when the son was born?
  31. 31.1 + 3 + 5 + … + 23 =
  32. 32.Do the 1089 trick with 401: reverse and subtract, then reverse that answer and add. What do you get?
  33. 33.Take 863. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  34. 34.Do the 1089 trick with 990: reverse and subtract, then reverse that answer and add. What do you get?
  35. 35.Half of 82 =
  36. 36.Magic square (every row, column and diagonal has the same total): 15 12 27 | 30 ? 6 | 9 24 21. What is the missing number?
  37. 37.19 × 4 =
  38. 38.9 × 1 =
  39. 39.If today is Tuesday, what day was it 60 days ago? (a) Saturday (b) Monday (c) Friday (d) Thursday
  40. 40.If today is Sunday, what day was it 31 days ago? (a) Wednesday (b) Thursday (c) Friday (d) Sunday

Answer key

  1. 3
  2. 891
  3. 84
  4. 10
  5. 168
  6. 3
  7. 1111111
  8. 222
  9. 792
  10. 34
  11. 1000
  12. 91
  13. 14
  14. 7
  15. 1089
  16. 25
  17. 45
  18. 123454321
  19. 5
  20. 7
  21. 49
  22. 49
  23. 3
  24. 1711
  25. 8
  26. 6
  27. Tuesday
  28. 999999999
  29. 1
  30. 24
  31. 144
  32. 1089
  33. 495
  34. 1089
  35. 41
  36. 18
  37. 76
  38. 9
  39. Friday
  40. Thursday

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