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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 815 · 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. 1.455 × 10 =
  2. 2.Think of 9. Multiply it by 4, then add 6. What number do you end with?
  3. 3.17 × 4 =
  4. 4.2?79 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.53 × 4 =
  6. 6.35 × 1000 =
  7. 7.1?81 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.1 + 3 + 5 + … + 45 =
  9. 9.19 × 4 =
  10. 10.Half of 32 =
  11. 11.4 × 1000 =
  12. 12.If today is Saturday, what day will it be after 98 days? (a) Friday (b) Saturday (c) Sunday (d) Tuesday
  13. 13.1 + 2 + 3 + … + 24 =
  14. 14.6 × 4 =
  15. 15.9 × 7 = ?3 — what is the missing digit?
  16. 16.8 × 9 =
  17. 17.Double 44 =
  18. 18.9 × 4 =
  19. 19.27 × ? = 27000
  20. 20.What comes next? 4, 8, 16, 32, ? (a) 64 (b) 65 (c) 56 (d) 48
  21. 21.I thought of a number, multiplied it by 4 and added 4. I got 56. What was my number?
  22. 22.A piggy bank has 6 coins of ₹5 and 9 coins of ₹2. How many rupees are in it?
  23. 23.Take 87 and take away the sum of its digits. What do you get?
  24. 24.A father is 30 years old and his son is 14. How old was the father when the son was born?
  25. 25.A father is 45 years old and his son is 6. How old was the father when the son was born?
  26. 26.Double 19 =
  27. 27.11 × 11 =
  28. 28.11 × 4 =
  29. 29.Double 23 =
  30. 30.32 × 100 =
  31. 31.1 + 2 + 3 + … + 95 =
  32. 32.393 × 10 =
  33. 33.1 + 2 + 3 + … + 12 =
  34. 34.9 × 2 = 1? — what is the missing digit?
  35. 35.12345678 × 9 + 9 =
  36. 36.In 2 years a boy will be 11 years old. How old was he 7 years ago?
  37. 37.Half of 192 =
  38. 38.32 × 4 =
  39. 39.1 + 3 + 5 + … + 13 =
  40. 40.What comes next? 1, 6, 11, 16, ? (a) 16 (b) 22 (c) 21 (d) 26

Answer key

  1. 4550
  2. 42
  3. 68
  4. 9
  5. 212
  6. 35000
  7. 8
  8. 529
  9. 76
  10. 16
  11. 4000
  12. Saturday
  13. 300
  14. 24
  15. 6
  16. 72
  17. 88
  18. 36
  19. 1000
  20. 64
  21. 13
  22. 48
  23. 72
  24. 16
  25. 39
  26. 38
  27. 121
  28. 44
  29. 46
  30. 3200
  31. 4560
  32. 3930
  33. 78
  34. 8
  35. 111111111
  36. 2
  37. 96
  38. 128
  39. 49
  40. 21

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