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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 173 · 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 Thursday, what day was it 33 days ago? (a) Tuesday (b) Saturday (c) Friday (d) Sunday
  2. 2.If today is Wednesday, what day was it 47 days ago? (a) Thursday (b) Saturday (c) Friday (d) Monday
  3. 3.1 + 2 + 3 + … + 95 =
  4. 4.1 + 3 + 5 + … + 43 =
  5. 5.9 × 9 =
  6. 6.Think of 2. Multiply it by 5, then add 6. What number do you end with?
  7. 7.1 + 3 + 5 + … + 31 =
  8. 8.9 × 8 =
  9. 9.9 × 6 =
  10. 10.21 × 4 =
  11. 11.12345679 × 18 =
  12. 12.A girl is 5 years old and her brother is 2 years older. How old will her brother be in 3 years?
  13. 13.11111 × 11111 =
  14. 14.9 × 2 = 1? — what is the missing digit?
  15. 15.In 6 years a boy will be 20 years old. How old was he 4 years ago?
  16. 16.9 × 4 = 3? — what is the missing digit?
  17. 17.What comes next? 10, 18, 26, 34, ? (a) 50 (b) 34 (c) 43 (d) 42
  18. 18.Double 36 =
  19. 19.Double 53 =
  20. 20.If today is Thursday, what day will it be after 70 days? (a) Wednesday (b) Sunday (c) Thursday (d) Friday
  21. 21.12345678 × 9 + 9 =
  22. 22.6 × 9 =
  23. 23.Double 65 =
  24. 24.Half of 52 =
  25. 25.20 × 4 =
  26. 26.Take 19 and take away the sum of its digits. What do you get?
  27. 27.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
  28. 28.25 × 4 =
  29. 29.?63 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.9 × 3 =
  31. 31.890 × 10 =
  32. 32.9 × 7 =
  33. 33.I thought of a number, multiplied it by 4 and added 8. I got 48. What was my number?
  34. 34.9 × 5 = 4? — what is the missing digit?
  35. 35.What comes next? 36, 49, 64, 81, ? (a) 98 (b) 101 (c) 102 (d) 100
  36. 36.Half of 172 =
  37. 37.A piggy bank has 3 coins of ₹5 and 13 coins of ₹2. How many rupees are in it?
  38. 38.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
  39. 39.85 × 100 =
  40. 40.Do the 1089 trick with 671: reverse and subtract, then reverse that answer and add. What do you get?

Answer key

  1. Saturday
  2. Friday
  3. 4560
  4. 484
  5. 81
  6. 16
  7. 256
  8. 72
  9. 54
  10. 84
  11. 222222222
  12. 10
  13. 123454321
  14. 8
  15. 10
  16. 6
  17. 42
  18. 72
  19. 106
  20. Thursday
  21. 111111111
  22. 54
  23. 130
  24. 26
  25. 80
  26. 9
  27. 297
  28. 100
  29. 9
  30. 27
  31. 8900
  32. 63
  33. 10
  34. 5
  35. 100
  36. 86
  37. 41
  38. 396
  39. 8500
  40. 1089

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