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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 958 · 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.?096 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.14 × 1000 =
  3. 3.9 × 5 =
  4. 4.What comes next? 2, 4, 8, 16, ? (a) 33 (b) 24 (c) 28 (d) 32
  5. 5.3?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.Take 29 and take away the sum of its digits. What do you get?
  7. 7.If today is Monday, what day was it 18 days ago? (a) Wednesday (b) Thursday (c) Friday (d) Sunday
  8. 8.Take 70 and take away the sum of its digits. What do you get?
  9. 9.Take 742. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  10. 10.What comes next? 3, 6, 12, 24, ? (a) 49 (b) 42 (c) 36 (d) 48
  11. 11.Take 68 and take away the sum of its digits. What do you get?
  12. 12.Magic square (every row, column and diagonal has the same total): 12 7 8 | ? 9 13 | 10 11 6. What is the missing number?
  13. 13.3?80 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.Double 23 =
  15. 15.1 + 2 + 3 + … + 10 =
  16. 16.9 × 6 = 5? — what is the missing digit?
  17. 17.What comes next? 5, 10, 20, 40, ? (a) 60 (b) 70 (c) 80 (d) 81
  18. 18.I thought of a number, added 1 and then doubled it. I got 14. What was my number?
  19. 19.2 × 1000 =
  20. 20.A father is 32 years old and his son is 6. How old was the father when the son was born?
  21. 21.If today is Monday, what day will it be after 18 days? (a) Friday (b) Thursday (c) Monday (d) Saturday
  22. 22.3 × 9 =
  23. 23.I thought of a number, multiplied it by 3 and added 3. I got 24. What was my number?
  24. 24.9 × 4 = ?6 — what is the missing digit?
  25. 25.7?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.9 × 6 = ?4 — what is the missing digit?
  27. 27.693 + 396 =
  28. 28.396 + 693 =
  29. 29.Magic square (every row, column and diagonal has the same total): 17 12 13 | 10 ? 18 | 15 16 11. What is the missing number?
  30. 30.Think of 8. Multiply it by 3, then add 1. What number do you end with?
  31. 31.What comes next? 12, 19, 26, 33, ? (a) 47 (b) 41 (c) 40 (d) 33
  32. 32.Think of 10. Multiply it by 4, then add 6. What number do you end with?
  33. 33.Double 54 =
  34. 34.195 × ? = 1950
  35. 35.?678 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.594 + 495 =
  37. 37.12345679 × 81 =
  38. 38.Take 681. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  39. 39.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
  40. 40.1 + 3 + 5 + … + 29 =

Answer key

  1. 3
  2. 14000
  3. 45
  4. 32
  5. 2
  6. 18
  7. Thursday
  8. 63
  9. 495
  10. 48
  11. 54
  12. 5
  13. 7
  14. 46
  15. 55
  16. 4
  17. 80
  18. 6
  19. 2000
  20. 26
  21. Friday
  22. 27
  23. 7
  24. 3
  25. 1
  26. 5
  27. 1089
  28. 1089
  29. 14
  30. 25
  31. 40
  32. 46
  33. 108
  34. 10
  35. 6
  36. 1089
  37. 999999999
  38. 495
  39. 297
  40. 225

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