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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 896 · 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.If today is Sunday, what day will it be after 85 days? (a) Thursday (b) Sunday (c) Monday (d) Tuesday
  2. 2.Magic trick! Think of 8. Double it, add 6, halve it, then take away 8. What number do you get?
  3. 3.Magic square (every row, column and diagonal has the same total): 15 36 21 | ? 24 18 | 27 12 33. What is the missing number?
  4. 4.I thought of a number, multiplied it by 4 and added 4. I got 12. What was my number?
  5. 5.821 × ? = 8210
  6. 6.12345679 × 63 =
  7. 7.Magic square (every row, column and diagonal has the same total): 17 10 15 | 12 14 16 | 13 ? 11. What is the missing number?
  8. 8.Think of 6. Multiply it by 4, then add 6. What number do you end with?
  9. 9.If today is Wednesday, what day will it be after 97 days? (a) Tuesday (b) Wednesday (c) Monday (d) Friday
  10. 10.9 × 6 = ?4 — what is the missing digit?
  11. 11.Double 68 =
  12. 12.What comes next? 4, 8, 16, 32, ? (a) 48 (b) 65 (c) 56 (d) 64
  13. 13.?340 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.Half of 22 =
  15. 15.1 + 2 + 3 + … + 27 =
  16. 16.9 × 2 = ?8 — what is the missing digit?
  17. 17.9 × 10 =
  18. 18.9 × 7 = 6? — what is the missing digit?
  19. 19.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
  20. 20.9 × 10 = 9? — what is the missing digit?
  21. 21.Magic trick! Think of 5. Double it, add 4, halve it, then take away 5. What number do you get?
  22. 22.5?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.Half of 132 =
  24. 24.A piggy bank has 7 coins of ₹5 and 2 coins of ₹2. How many rupees are in it?
  25. 25.12345679 × 81 =
  26. 26.Magic trick! Think of 2. Double it, add 8, halve it, then take away 2. What number do you get?
  27. 27.1 + 3 + 5 + … + 49 =
  28. 28.1 + 3 + 5 + … + 29 =
  29. 29.9 × 5 =
  30. 30.Magic trick! Think of 6. Double it, add 16, halve it, then take away 6. What number do you get?
  31. 31.I thought of a number, added 8 and then doubled it. I got 36. What was my number?
  32. 32.Do the 1089 trick with 590: reverse and subtract, then reverse that answer and add. What do you get?
  33. 33.I thought of a number, added 7 and then doubled it. I got 54. What was my number?
  34. 34.Take 910. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  35. 35.17 × 4 =
  36. 36.Magic square (every row, column and diagonal has the same total): 10 17 12 | 15 13 11 | ? 9 16. What is the missing number?
  37. 37.10 × 9 =
  38. 38.What comes next? 3, 6, 12, 24, ? (a) 49 (b) 42 (c) 48 (d) 36
  39. 39.What comes next? 1, 2, 4, 8, ? (a) 17 (b) 14 (c) 16 (d) 12
  40. 40.269 × ? = 2690

Answer key

  1. Monday
  2. 3
  3. 30
  4. 2
  5. 10
  6. 777777777
  7. 18
  8. 30
  9. Tuesday
  10. 5
  11. 136
  12. 64
  13. 2
  14. 11
  15. 378
  16. 1
  17. 90
  18. 3
  19. 891
  20. 0
  21. 2
  22. 8
  23. 66
  24. 39
  25. 999999999
  26. 4
  27. 625
  28. 225
  29. 45
  30. 8
  31. 10
  32. 1089
  33. 20
  34. 891
  35. 68
  36. 14
  37. 90
  38. 48
  39. 16
  40. 10

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