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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 446 · 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 + 3 + 5 + … + 33 =
  2. 2.79?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.Magic trick! Think of 5. Double it, add 14, halve it, then take away 5. What number do you get?
  4. 4.1 + 2 + 3 + … + 15 =
  5. 5.If today is Friday, what day was it 39 days ago? (a) Monday (b) Thursday (c) Sunday (d) Tuesday
  6. 6.A piggy bank has 2 coins of ₹5 and 8 coins of ₹2. How many rupees are in it?
  7. 7.9 × 6 = ?4 — what is the missing digit?
  8. 8.9 × 7 = ?3 — what is the missing digit?
  9. 9.9 × 10 = ?0 — what is the missing digit?
  10. 10.I thought of a number, multiplied it by 5 and added 2. I got 42. What was my number?
  11. 11.37 × 3 =
  12. 12.57 × 4 =
  13. 13.1 + 3 + 5 + … + 17 =
  14. 14.9 × 9 = ?1 — what is the missing digit?
  15. 15.If today is Saturday, what day was it 30 days ago? (a) Thursday (b) Wednesday (c) Sunday (d) Friday
  16. 16.Double 64 =
  17. 17.741? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.804? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
  20. 20.A girl is 11 years old and her brother is 6 years older. How old will her brother be in 5 years?
  21. 21.768? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.22 × 4 =
  23. 23.14 × 4 =
  24. 24.I thought of a number, added 6 and then doubled it. I got 32. What was my number?
  25. 25.A girl is 5 years old and her brother is 2 years older. How old will her brother be in 4 years?
  26. 26.52 × 4 =
  27. 27.If today is Tuesday, what day will it be after 70 days? (a) Wednesday (b) Friday (c) Tuesday (d) Monday
  28. 28.Magic trick! Think of 3. Double it, add 10, halve it, then take away 3. What number do you get?
  29. 29.44 × 4 =
  30. 30.9 × 7 =
  31. 31.A piggy bank has 3 coins of ₹5 and 2 coins of ₹2. How many rupees are in it?
  32. 32.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
  33. 33.9 × 3 = ?7 — what is the missing digit?
  34. 34.4 × 9 =
  35. 35.9 × 9 =
  36. 36.9 × 5 = 4? — what is the missing digit?
  37. 37.18 × 1000 =
  38. 38.What comes next? 3, 12, 21, 30, ? (a) 40 (b) 48 (c) 39 (d) 30
  39. 39.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
  40. 40.A girl is 12 years old and her brother is 6 years older. How old will her brother be in 8 years?

Answer key

  1. 289
  2. 2
  3. 7
  4. 120
  5. Monday
  6. 26
  7. 5
  8. 6
  9. 9
  10. 8
  11. 111
  12. 228
  13. 81
  14. 8
  15. Thursday
  16. 128
  17. 6
  18. 6
  19. 891
  20. 22
  21. 6
  22. 88
  23. 56
  24. 10
  25. 11
  26. 208
  27. Tuesday
  28. 5
  29. 176
  30. 63
  31. 19
  32. 297
  33. 2
  34. 36
  35. 81
  36. 5
  37. 18000
  38. 39
  39. 594
  40. 26

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