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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 895 · 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.If today is Saturday, what day was it 34 days ago? (a) Monday (b) Sunday (c) Wednesday (d) Saturday
  2. 2.9 × 10 =
  3. 3.Magic square (every row, column and diagonal has the same total): 30 15 18 | ? 21 33 | 24 27 12. What is the missing number?
  4. 4.1 × 9 =
  5. 5.If today is Wednesday, what day will it be after 23 days? (a) Thursday (b) Monday (c) Friday (d) Saturday
  6. 6.Magic square (every row, column and diagonal has the same total): 8 13 6 | 7 9 ? | 12 5 10. What is the missing number?
  7. 7.Magic square (every row, column and diagonal has the same total): 13 3 17 | 15 11 7 | 5 19 ?. What is the missing number?
  8. 8.1234 × 8 + 4 =
  9. 9.12345679 × 36 =
  10. 10.3 × 1000 =
  11. 11.9 × 1 =
  12. 12.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
  13. 13.37 × 4 =
  14. 14.Think of 10. Multiply it by 5, then add 4. What number do you end with?
  15. 15.What comes next? 2, 4, 8, 16, ? (a) 24 (b) 33 (c) 28 (d) 32
  16. 16.43 × 100 =
  17. 17.What comes next? 25, 36, 49, 64, ? (a) 81 (b) 79 (c) 82 (d) 83
  18. 18.If today is Monday, what day was it 59 days ago? (a) Thursday (b) Monday (c) Saturday (d) Friday
  19. 19.9 × 6 = 5? — what is the missing digit?
  20. 20.A piggy bank has 5 coins of ₹5 and 11 coins of ₹2. How many rupees are in it?
  21. 21.297 + 792 =
  22. 22.Take 650. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  23. 23.Magic square (every row, column and diagonal has the same total): 23 26 11 | 8 20 ? | 29 14 17. What is the missing number?
  24. 24.9 × 9 = ?1 — what is the missing digit?
  25. 25.What comes next? 1, 2, 4, 8, ? (a) 14 (b) 16 (c) 17 (d) 12
  26. 26.Double 54 =
  27. 27.Magic trick! Think of 14. Double it, add 18, halve it, then take away 14. What number do you get?
  28. 28.38 × 100 =
  29. 29.What comes next? 9, 18, 27, 36, ? (a) 54 (b) 46 (c) 36 (d) 45
  30. 30.1 + 2 + 3 + … + 21 =
  31. 31.Half of 86 =
  32. 32.8 × 4 =
  33. 33.9 × 7 = ?3 — what is the missing digit?
  34. 34.34 × 4 =
  35. 35.If today is Friday, what day will it be after 34 days? (a) Wednesday (b) Thursday (c) Sunday (d) Friday
  36. 36.Take 865. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  37. 37.A girl is 7 years old and her brother is 5 years older. How old will her brother be in 5 years?
  38. 38.Take 55 and take away the sum of its digits. What do you get?
  39. 39.12345 × 8 + 5 =
  40. 40.A piggy bank has 7 coins of ₹5 and 3 coins of ₹2. How many rupees are in it?

Answer key

  1. Sunday
  2. 90
  3. 9
  4. 9
  5. Friday
  6. 11
  7. 9
  8. 9876
  9. 444444444
  10. 3000
  11. 9
  12. 495
  13. 148
  14. 54
  15. 32
  16. 4300
  17. 81
  18. Friday
  19. 4
  20. 47
  21. 1089
  22. 594
  23. 32
  24. 8
  25. 16
  26. 108
  27. 9
  28. 3800
  29. 45
  30. 231
  31. 43
  32. 32
  33. 6
  34. 136
  35. Thursday
  36. 297
  37. 17
  38. 45
  39. 98765
  40. 41

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