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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 835 · 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.Double 85 =
  2. 2.99 × ? = 990
  3. 3.97 × 100 =
  4. 4.1 + 2 + 3 + … + 84 =
  5. 5.18 × 4 =
  6. 6.9 × 10 = 9? — what is the missing digit?
  7. 7.9 × 6 = 5? — what is the missing digit?
  8. 8.Magic square (every row, column and diagonal has the same total): ? 5 26 | 23 17 11 | 8 29 14. What is the missing number?
  9. 9.123456789 × 8 + 9 =
  10. 10.I thought of a number, multiplied it by 4 and added 1. I got 25. What was my number?
  11. 11.If today is Wednesday, what day was it 13 days ago? (a) Thursday (b) Wednesday (c) Friday (d) Sunday
  12. 12.A piggy bank has 9 coins of ₹5 and 12 coins of ₹2. How many rupees are in it?
  13. 13.6 × 9 =
  14. 14.The 6th of a month is a Sunday. What day is the 29th of the same month? (a) Friday (b) Tuesday (c) Monday (d) Wednesday
  15. 15.71 × 100 =
  16. 16.24 × 4 =
  17. 17.Take 390. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  18. 18.The ages of two twins add up to 12. How old is each twin?
  19. 19.If today is Tuesday, what day will it be after 31 days? (a) Saturday (b) Thursday (c) Friday (d) Monday
  20. 20.7 × 9 =
  21. 21.A father is 41 years old and his son is 13. How old was the father when the son was born?
  22. 22.3 × 9 =
  23. 23.1234 × 8 + 4 =
  24. 24.45 × ? = 45000
  25. 25.Take 52 and take away the sum of its digits. What do you get?
  26. 26.1 + 2 + 3 + … + 71 =
  27. 27.123456 × 8 + 6 =
  28. 28.A piggy bank has 9 coins of ₹5 and 10 coins of ₹2. How many rupees are in it?
  29. 29.96 × 10 =
  30. 30.9 × 7 =
  31. 31.1 + 2 + 3 + … + 99 =
  32. 32.22 × ? = 22000
  33. 33.?012 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.1 + 2 + 3 + … + 51 =
  35. 35.What comes next? 1, 2, 4, 8, ? (a) 14 (b) 17 (c) 16 (d) 12
  36. 36.32 × 100 =
  37. 37.36 × 4 =
  38. 38.?219 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.12345678 × 9 + 9 =
  40. 40.9 × 5 =

Answer key

  1. 170
  2. 10
  3. 9700
  4. 3570
  5. 72
  6. 0
  7. 4
  8. 20
  9. 987654321
  10. 6
  11. Thursday
  12. 69
  13. 54
  14. Tuesday
  15. 7100
  16. 96
  17. 297
  18. 6
  19. Friday
  20. 63
  21. 28
  22. 27
  23. 9876
  24. 1000
  25. 45
  26. 2556
  27. 987654
  28. 65
  29. 960
  30. 63
  31. 4950
  32. 1000
  33. 6
  34. 1326
  35. 16
  36. 3200
  37. 144
  38. 6
  39. 111111111
  40. 45

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