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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 245 · 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. 1.396 + 693 =
  2. 2.In 6 years a boy will be 17 years old. How old was he 3 years ago?
  3. 3.12 × 9 + 3 =
  4. 4.Double 73 =
  5. 5.Double 11 =
  6. 6.12345679 × 18 =
  7. 7.1 × 9 =
  8. 8.8 × 9 =
  9. 9.If today is Wednesday, what day was it 36 days ago? (a) Wednesday (b) Monday (c) Friday (d) Tuesday
  10. 10.Magic trick! Think of 20. Double it, add 10, halve it, then take away 20. What number do you get?
  11. 11.I thought of a number, multiplied it by 4 and added 6. I got 26. What was my number?
  12. 12.580 × ? = 5800
  13. 13.The ages of two twins add up to 12. How old is each twin?
  14. 14.9 × 3 = ?7 — what is the missing digit?
  15. 15.1 + 2 + 3 + … + 93 =
  16. 16.The ages of two twins add up to 28. How old is each twin?
  17. 17.Half of 124 =
  18. 18.1 + 3 + 5 + … + 19 =
  19. 19.Half of 118 =
  20. 20.408 × 10 =
  21. 21.1 + 2 + 3 + … + 20 =
  22. 22.7 × 9 =
  23. 23.11 × 4 =
  24. 24.Half of 34 =
  25. 25.27 × 1000 =
  26. 26.10 × 4 =
  27. 27.Double 44 =
  28. 28.12345679 × 72 =
  29. 29.I thought of a number, added 8 and then doubled it. I got 56. What was my number?
  30. 30.1234567 × 8 + 7 =
  31. 31.Half of 52 =
  32. 32.12345679 × 54 =
  33. 33.A piggy bank has 3 coins of ₹5 and 9 coins of ₹2. How many rupees are in it?
  34. 34.If today is Wednesday, what day was it 46 days ago? (a) Sunday (b) Tuesday (c) Saturday (d) Friday
  35. 35.If today is Thursday, what day will it be after 53 days? (a) Tuesday (b) Thursday (c) Sunday (d) Monday
  36. 36.198 + 891 =
  37. 37.60 × 4 =
  38. 38.1 + 3 + 5 + … + 9 =
  39. 39.1 + 2 + 3 + … + 88 =
  40. 40.604? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

  1. 1089
  2. 8
  3. 111
  4. 146
  5. 22
  6. 222222222
  7. 9
  8. 72
  9. Tuesday
  10. 5
  11. 5
  12. 10
  13. 6
  14. 2
  15. 4371
  16. 14
  17. 62
  18. 100
  19. 59
  20. 4080
  21. 210
  22. 63
  23. 44
  24. 17
  25. 27000
  26. 40
  27. 88
  28. 888888888
  29. 20
  30. 9876543
  31. 26
  32. 666666666
  33. 33
  34. Saturday
  35. Monday
  36. 1089
  37. 240
  38. 25
  39. 3916
  40. 8

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