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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 882 · 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 × 9 = 8? — what is the missing digit?
  2. 2.210 × 10 =
  3. 3.If today is Monday, what day was it 11 days ago? (a) Wednesday (b) Friday (c) Thursday (d) Sunday
  4. 4.41 × ? = 41000
  5. 5.21 × 1000 =
  6. 6.9 × 3 = ?7 — what is the missing digit?
  7. 7.What comes next? 11, 15, 19, 23, ? (a) 31 (b) 23 (c) 28 (d) 27
  8. 8.9 × 10 = ?0 — what is the missing digit?
  9. 9.I thought of a number, added 6 and then doubled it. I got 26. What was my number?
  10. 10.What comes next? 5, 14, 23, 32, ? (a) 32 (b) 50 (c) 41 (d) 42
  11. 11.If today is Friday, what day will it be after 18 days? (a) Friday (b) Monday (c) Tuesday (d) Wednesday
  12. 12.12 × 8 + 2 =
  13. 13.9 × 7 = 6? — what is the missing digit?
  14. 14.9 × 4 = 3? — what is the missing digit?
  15. 15.682 × 10 =
  16. 16.2 × 9 =
  17. 17.A father is 38 years old and his son is 5. How old was the father when the son was born?
  18. 18.960 × 10 =
  19. 19.1234 × 9 + 5 =
  20. 20.Take 960. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  21. 21.Take 125. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  22. 22.8 × 4 =
  23. 23.?534 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.1234567 × 9 + 8 =
  25. 25.19 × 4 =
  26. 26.Take 44 and take away the sum of its digits. What do you get?
  27. 27.7?55 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.272 × 10 =
  29. 29.Take 640. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  30. 30.43 × 100 =
  31. 31.What comes next? 10, 12, 14, 16, ? (a) 19 (b) 20 (c) 16 (d) 18
  32. 32.A piggy bank has 5 coins of ₹5 and 5 coins of ₹2. How many rupees are in it?
  33. 33.11111 × 11111 =
  34. 34.21 × 4 =
  35. 35.In 5 years a boy will be 17 years old. How old was he 3 years ago?
  36. 36.921 × 10 =
  37. 37.9 × 10 = 9? — what is the missing digit?
  38. 38.8 × 9 =
  39. 39.The 6th of a month is a Monday. What day is the 14th of the same month? (a) Tuesday (b) Monday (c) Wednesday (d) Friday
  40. 40.Take 378. Reverse its digits and take the smaller number away from the bigger one. What do you get?

Answer key

  1. 1
  2. 2100
  3. Thursday
  4. 1000
  5. 21000
  6. 2
  7. 27
  8. 9
  9. 7
  10. 41
  11. Tuesday
  12. 98
  13. 3
  14. 6
  15. 6820
  16. 18
  17. 33
  18. 9600
  19. 11111
  20. 891
  21. 396
  22. 32
  23. 6
  24. 11111111
  25. 76
  26. 36
  27. 1
  28. 2720
  29. 594
  30. 4300
  31. 18
  32. 35
  33. 123454321
  34. 84
  35. 9
  36. 9210
  37. 0
  38. 72
  39. Tuesday
  40. 495

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