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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 862 · 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. 1.1 × 9 =
  2. 2.Double 65 =
  3. 3.123 × 8 + 3 =
  4. 4.If today is Saturday, what day will it be after 60 days? (a) Saturday (b) Tuesday (c) Thursday (d) Wednesday
  5. 5.I thought of a number, multiplied it by 5 and added 4. I got 14. What was my number?
  6. 6.46 × 4 =
  7. 7.1 + 2 + 3 + … + 78 =
  8. 8.12345679 × 18 =
  9. 9.?695 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.Take 720. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  11. 11.12345678 × 8 + 8 =
  12. 12.If today is Tuesday, what day was it 16 days ago? (a) Monday (b) Sunday (c) Wednesday (d) Saturday
  13. 13.Double 32 =
  14. 14.Take 14 and take away the sum of its digits. What do you get?
  15. 15.9 × 2 = 1? — what is the missing digit?
  16. 16.9 × 2 = ?8 — what is the missing digit?
  17. 17.39 × 4 =
  18. 18.1 + 3 + 5 + … + 27 =
  19. 19.111111 × 111111 =
  20. 20.10 × 9 =
  21. 21.9 × 10 = ?0 — what is the missing digit?
  22. 22.192 × 10 =
  23. 23.Magic square (every row, column and diagonal has the same total): 12 22 20 | ? 18 10 | 16 14 24. What is the missing number?
  24. 24.Magic square (every row, column and diagonal has the same total): 7 12 5 | 6 ? 10 | 11 4 9. What is the missing number?
  25. 25.A piggy bank has 5 coins of ₹5 and 12 coins of ₹2. How many rupees are in it?
  26. 26.Take 874. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  27. 27.1 + 3 + 5 + … + 23 =
  28. 28.37 × 6 =
  29. 29.What comes next? 10, 17, 24, 31, ? (a) 39 (b) 38 (c) 45 (d) 31
  30. 30.A father is 37 years old and his son is 9. How old was the father when the son was born?
  31. 31.16 × 4 =
  32. 32.5?84 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.979 × 10 =
  34. 34.1 + 2 + 3 + … + 100 =
  35. 35.9 × 9 = 8? — what is the missing digit?
  36. 36.Half of 16 =
  37. 37.A father is 38 years old and his son is 13. How old was the father when the son was born?
  38. 38.Magic trick! Think of 9. Double it, add 12, halve it, then take away 9. What number do you get?
  39. 39.1 + 3 + 5 + … + 47 =
  40. 40.378 × 10 =

Answer key

  1. 9
  2. 130
  3. 987
  4. Wednesday
  5. 2
  6. 184
  7. 3081
  8. 222222222
  9. 7
  10. 693
  11. 98765432
  12. Sunday
  13. 64
  14. 9
  15. 8
  16. 1
  17. 156
  18. 196
  19. 12345654321
  20. 90
  21. 9
  22. 1920
  23. 26
  24. 8
  25. 49
  26. 396
  27. 144
  28. 222
  29. 38
  30. 28
  31. 64
  32. 1
  33. 9790
  34. 5050
  35. 1
  36. 8
  37. 25
  38. 6
  39. 576
  40. 3780

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