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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 4 · 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.Think of 13. Multiply it by 2, then add 1. What number do you end with?
  2. 2.9 × 7 = ?3 — what is the missing digit?
  3. 3.42 × 4 =
  4. 4.1 + 2 + 3 + … + 42 =
  5. 5.I thought of a number, multiplied it by 5 and added 2. I got 72. What was my number?
  6. 6.Take 900. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  7. 7.Do the 1089 trick with 664: reverse and subtract, then reverse that answer and add. What do you get?
  8. 8.Do the 1089 trick with 833: reverse and subtract, then reverse that answer and add. What do you get?
  9. 9.154 × 10 =
  10. 10.1 + 3 + 5 + … + 17 =
  11. 11.9 × 9 = ?1 — what is the missing digit?
  12. 12.If today is Wednesday, what day will it be after 60 days? (a) Wednesday (b) Sunday (c) Monday (d) Saturday
  13. 13.9 × 4 = ?6 — what is the missing digit?
  14. 14.5 × 9 =
  15. 15.Do the 1089 trick with 481: reverse and subtract, then reverse that answer and add. What do you get?
  16. 16.891 + 198 =
  17. 17.?510 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.In the 1089 trick, the subtraction gave a 3-digit number that starts with 7. What is that number?
  19. 19.11 × 11 =
  20. 20.962 × 10 =
  21. 21.12345679 × 81 =
  22. 22.9 × 7 = 6? — what is the missing digit?
  23. 23.22 × 4 =
  24. 24.If today is Wednesday, what day was it 45 days ago? (a) Sunday (b) Saturday (c) Monday (d) Wednesday
  25. 25.Half of 46 =
  26. 26.A father is 36 years old and his son is 6. How old was the father when the son was born?
  27. 27.You have 5 coins. Each coin is ₹1 or ₹2, and together they make ₹9. How many ₹2 coins do you have?
  28. 28.Magic square (every row, column and diagonal has the same total): 11 16 9 | 10 12 14 | 15 ? 13. What is the missing number?
  29. 29.1 + 2 + 3 + … + 80 =
  30. 30.I thought of a number, added 3 and then doubled it. I got 12. What was my number?
  31. 31.12345 × 9 + 6 =
  32. 32.9 × 9 =
  33. 33.9 × 6 = 5? — what is the missing digit?
  34. 34.547? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.What comes next? 4, 8, 16, 32, ? (a) 65 (b) 64 (c) 56 (d) 48
  36. 36.If today is Wednesday, what day will it be after 55 days? (a) Tuesday (b) Wednesday (c) Monday (d) Friday
  37. 37.1 + 3 + 5 + … + 49 =
  38. 38.I thought of a number, added 2 and then doubled it. I got 18. What was my number?
  39. 39.If today is Tuesday, what day will it be after 40 days? (a) Monday (b) Sunday (c) Saturday (d) Wednesday
  40. 40.1 + 3 + 5 + … + 21 =

Answer key

  1. 27
  2. 6
  3. 168
  4. 903
  5. 14
  6. 891
  7. 1089
  8. 1089
  9. 1540
  10. 81
  11. 8
  12. Sunday
  13. 3
  14. 45
  15. 1089
  16. 1089
  17. 3
  18. 792
  19. 121
  20. 9620
  21. 999999999
  22. 3
  23. 88
  24. Sunday
  25. 23
  26. 30
  27. 4
  28. 8
  29. 3240
  30. 3
  31. 111111
  32. 81
  33. 4
  34. 2
  35. 64
  36. Tuesday
  37. 625
  38. 7
  39. Sunday
  40. 121

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