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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 960 · 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. 1.3?69 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.9 × 9 = 8? — what is the missing digit?
  3. 3.1 + 2 + 3 + … + 19 =
  4. 4.Magic square (every row, column and diagonal has the same total): 14 ? 26 | 29 17 5 | 8 23 20. What is the missing number?
  5. 5.Half of 182 =
  6. 6.3?14 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.If today is Friday, what day will it be after 21 days? (a) Monday (b) Thursday (c) Friday (d) Saturday
  8. 8.Do the 1089 trick with 248: reverse and subtract, then reverse that answer and add. What do you get?
  9. 9.9 × 3 = ?7 — what is the missing digit?
  10. 10.2 × 9 =
  11. 11.I thought of a number, multiplied it by 2 and added 1. I got 11. What was my number?
  12. 12.If today is Sunday, what day was it 23 days ago? (a) Monday (b) Saturday (c) Thursday (d) Friday
  13. 13.10 × 9 =
  14. 14.9 × 9 = ?1 — what is the missing digit?
  15. 15.Think of 9. Multiply it by 3, then add 4. What number do you end with?
  16. 16.Think of 7. Multiply it by 5, then add 2. What number do you end with?
  17. 17.Take 810. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  18. 18.Take 32 and take away the sum of its digits. What do you get?
  19. 19.44 × 4 =
  20. 20.4 × 9 =
  21. 21.A piggy bank has 5 coins of ₹5 and 7 coins of ₹2. How many rupees are in it?
  22. 22.Double 82 =
  23. 23.9 × 4 =
  24. 24.49 × 4 =
  25. 25.61 × 100 =
  26. 26.23 × 1000 =
  27. 27.62?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.Take 902. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  29. 29.In the 1089 trick, the subtraction gave a 3-digit number that starts with 7. What is that number?
  30. 30.9 × 2 =
  31. 31.Take 408. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  32. 32.What comes next? 1, 2, 4, 8, ? (a) 12 (b) 14 (c) 16 (d) 17
  33. 33.1 + 3 + 5 + … + 17 =
  34. 34.If today is Monday, what day was it 42 days ago? (a) Sunday (b) Tuesday (c) Monday (d) Thursday
  35. 35.The 3rd of a month is a Tuesday. What day is the 29th of the same month? (a) Saturday (b) Monday (c) Sunday (d) Wednesday
  36. 36.What comes next? 16, 25, 36, 49, ? (a) 64 (b) 65 (c) 62 (d) 66
  37. 37.167 × ? = 1670
  38. 38.6 × 9 =
  39. 39.In 2 years a boy will be 10 years old. How old was he 4 years ago?
  40. 40.A father is 41 years old and his son is 6. How old was the father when the son was born?

Answer key

  1. 9
  2. 1
  3. 190
  4. 11
  5. 91
  6. 1
  7. Friday
  8. 1089
  9. 2
  10. 18
  11. 5
  12. Friday
  13. 90
  14. 8
  15. 31
  16. 37
  17. 792
  18. 27
  19. 176
  20. 36
  21. 39
  22. 164
  23. 36
  24. 196
  25. 6100
  26. 23000
  27. 6
  28. 693
  29. 792
  30. 18
  31. 396
  32. 16
  33. 81
  34. Monday
  35. Sunday
  36. 64
  37. 10
  38. 54
  39. 4
  40. 35

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