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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 720 · 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. 1.25 × 4 =
  2. 2.7 × 9 =
  3. 3.1234567 × 8 + 7 =
  4. 4.1 + 3 + 5 + … + 49 =
  5. 5.Odd one out: which number is NOT in the 3 times table? (a) 18 (b) 15 (c) 6 (d) 11
  6. 6.9 × 3 = 2? — what is the missing digit?
  7. 7.59 × 10 =
  8. 8.11? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.Take 14 and take away the sum of its digits. What do you get?
  10. 10.Take 135. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  11. 11.9 × 5 = ?5 — what is the missing digit?
  12. 12.Do the 1089 trick with 730: reverse and subtract, then reverse that answer and add. What do you get?
  13. 13.You have 5 coins. Each coin is ₹1 or ₹2, and together they make ₹9. How many ₹2 coins do you have?
  14. 14.1 × 9 =
  15. 15.1 + 2 + 3 + … + 11 =
  16. 16.You have 9 coins. Each coin is ₹1 or ₹2, and together they make ₹17. How many ₹2 coins do you have?
  17. 17.If today is Wednesday, what day will it be after 29 days? (a) Friday (b) Thursday (c) Wednesday (d) Sunday
  18. 18.1 + 3 + 5 + … + 25 =
  19. 19.What comes next? 20, 24, 28, 32, ? (a) 32 (b) 40 (c) 36 (d) 37
  20. 20.Magic square (every row, column and diagonal has the same total): 22 25 10 | 7 ? 31 | 28 13 16. What is the missing number?
  21. 21.Take 20 and take away the sum of its digits. What do you get?
  22. 22.37 × 4 =
  23. 23.If today is Thursday, what day will it be after 80 days? (a) Monday (b) Sunday (c) Saturday (d) Wednesday
  24. 24.The 8th of a month is a Tuesday. What day is the 28th of the same month? (a) Thursday (b) Tuesday (c) Sunday (d) Monday
  25. 25.1 + 2 + 3 + … + 69 =
  26. 26.You have 11 coins. Each coin is ₹1 or ₹2, and together they make ₹19. How many ₹2 coins do you have?
  27. 27.Take 911. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  28. 28.198 + 891 =
  29. 29.40 × 4 =
  30. 30.9 × 5 = 4? — what is the missing digit?
  31. 31.Magic square (every row, column and diagonal has the same total): 12 13 8 | 7 ? 15 | 14 9 10. What is the missing number?
  32. 32.23 × 4 =
  33. 33.9 × 7 = ?3 — what is the missing digit?
  34. 34.I thought of a number, added 9 and then doubled it. I got 52. What was my number?
  35. 35.Magic square (every row, column and diagonal has the same total): 17 10 15 | 12 ? 16 | 13 18 11. What is the missing number?
  36. 36.15 × 4 =
  37. 37.What comes next? 4, 9, 16, 25, ? (a) 37 (b) 34 (c) 36 (d) 38
  38. 38.87?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.If today is Sunday, what day was it 60 days ago? (a) Thursday (b) Saturday (c) Tuesday (d) Wednesday
  40. 40.Odd one out: which number is NOT in the 5 times table? (a) 10 (b) 15 (c) 30 (d) 42

Answer key

  1. 100
  2. 63
  3. 9876543
  4. 625
  5. 11
  6. 7
  7. 590
  8. 7
  9. 9
  10. 396
  11. 4
  12. 1089
  13. 4
  14. 9
  15. 66
  16. 8
  17. Thursday
  18. 169
  19. 36
  20. 19
  21. 18
  22. 148
  23. Sunday
  24. Monday
  25. 2415
  26. 8
  27. 792
  28. 1089
  29. 160
  30. 5
  31. 11
  32. 92
  33. 6
  34. 17
  35. 14
  36. 60
  37. 36
  38. 4
  39. Wednesday
  40. 42

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