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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 386 · 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. 1.9 × 10 =
  2. 2.1 + 2 + 3 + … + 44 =
  3. 3.If today is Friday, what day will it be after 55 days? (a) Wednesday (b) Sunday (c) Thursday (d) Friday
  4. 4.Do the 1089 trick with 600: reverse and subtract, then reverse that answer and add. What do you get?
  5. 5.9 × 8 = ?2 — what is the missing digit?
  6. 6.You have 12 coins. Each coin is ₹1 or ₹2, and together they make ₹18. How many ₹2 coins do you have?
  7. 7.If today is Sunday, what day was it 13 days ago? (a) Thursday (b) Tuesday (c) Monday (d) Sunday
  8. 8.1 + 2 + 3 + … + 84 =
  9. 9.594 + 495 =
  10. 10.Think of 10. Multiply it by 5, then add 3. What number do you end with?
  11. 11.Double 71 =
  12. 12.4 × 9 =
  13. 13.9 × 9 =
  14. 14.600? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.Magic square (every row, column and diagonal has the same total): 18 21 6 | 3 15 27 | 24 ? 12. What is the missing number?
  16. 16.?268 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.Take 401. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  18. 18.12345 × 9 + 6 =
  19. 19.47 × 4 =
  20. 20.What comes next? 16, 25, 36, 49, ? (a) 65 (b) 64 (c) 66 (d) 62
  21. 21.In the 1089 trick, the subtraction gave a 3-digit number that starts with 7. What is that number?
  22. 22.33 × 4 =
  23. 23.29 × 4 =
  24. 24.Magic square (every row, column and diagonal has the same total): ? 7 12 | 9 11 13 | 10 15 8. What is the missing number?
  25. 25.Think of 4. Multiply it by 3, then add 1. What number do you end with?
  26. 26.3 × 9 =
  27. 27.The 2nd of a month is a Saturday. What day is the 26th of the same month? (a) Wednesday (b) Monday (c) Tuesday (d) Friday
  28. 28.Take 30 and take away the sum of its digits. What do you get?
  29. 29.Magic square (every row, column and diagonal has the same total): 27 6 21 | ? 18 24 | 15 30 9. What is the missing number?
  30. 30.1 + 3 + 5 + … + 11 =
  31. 31.Think of 7. Multiply it by 5, then add 9. What number do you end with?
  32. 32.If today is Monday, what day was it 14 days ago? (a) Thursday (b) Sunday (c) Monday (d) Tuesday
  33. 33.If today is Saturday, what day will it be after 9 days? (a) Monday (b) Tuesday (c) Thursday (d) Sunday
  34. 34.I thought of a number, added 3 and then doubled it. I got 34. What was my number?
  35. 35.1 + 2 + 3 + … + 35 =
  36. 36.Double 19 =
  37. 37.12 × 9 + 3 =
  38. 38.If today is Thursday, what day will it be after 18 days? (a) Thursday (b) Monday (c) Tuesday (d) Sunday
  39. 39.Magic square (every row, column and diagonal has the same total): 2 9 4 | 7 5 ? | 6 1 8. What is the missing number?
  40. 40.12345679 × 36 =

Answer key

  1. 90
  2. 990
  3. Thursday
  4. 1089
  5. 7
  6. 6
  7. Monday
  8. 3570
  9. 1089
  10. 53
  11. 142
  12. 36
  13. 81
  14. 3
  15. 9
  16. 2
  17. 297
  18. 111111
  19. 188
  20. 64
  21. 792
  22. 132
  23. 116
  24. 14
  25. 13
  26. 27
  27. Tuesday
  28. 27
  29. 12
  30. 36
  31. 44
  32. Monday
  33. Monday
  34. 14
  35. 630
  36. 38
  37. 111
  38. Monday
  39. 3
  40. 444444444

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