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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 101 · 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 + 2 + 3 + … + 14 =
  2. 2.If today is Monday, what day will it be after 15 days? (a) Wednesday (b) Monday (c) Tuesday (d) Friday
  3. 3.The ages of two twins add up to 26. How old is each twin?
  4. 4.9 × 5 =
  5. 5.1234567 × 8 + 7 =
  6. 6.2 × 9 =
  7. 7.9 × 3 = 2? — what is the missing digit?
  8. 8.A father is 31 years old and his son is 10. How old was the father when the son was born?
  9. 9.49 × 4 =
  10. 10.Magic square (every row, column and diagonal has the same total): ? 10 3 | 4 6 8 | 9 2 7. What is the missing number?
  11. 11.101? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.A father is 39 years old and his son is 5. How old was the father when the son was born?
  13. 13.You have 11 coins. Each coin is ₹1 or ₹2, and together they make ₹15. How many ₹2 coins do you have?
  14. 14.12345679 × 54 =
  15. 15.9 × 2 = ?8 — what is the missing digit?
  16. 16.9 × 3 =
  17. 17.I thought of a number, added 6 and then doubled it. I got 20. What was my number?
  18. 18.52 × 4 =
  19. 19.9 × 6 =
  20. 20.6 × 100 =
  21. 21.11 × 11 =
  22. 22.Half of 12 =
  23. 23.Take 30 and take away the sum of its digits. What do you get?
  24. 24.Half of 176 =
  25. 25.15 × 4 =
  26. 26.1 + 3 + 5 + … + 9 =
  27. 27.4 × 9 =
  28. 28.1 × 9 =
  29. 29.9 × 3 = ?7 — what is the missing digit?
  30. 30.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
  31. 31.A father is 30 years old and his son is 14. How old was the father when the son was born?
  32. 32.Half of 188 =
  33. 33.If today is Friday, what day was it 50 days ago? (a) Friday (b) Wednesday (c) Sunday (d) Thursday
  34. 34.I thought of a number, added 5 and then doubled it. I got 24. What was my number?
  35. 35.In 6 years a boy will be 14 years old. How old was he 6 years ago?
  36. 36.If today is Monday, what day will it be after 21 days? (a) Tuesday (b) Sunday (c) Thursday (d) Monday
  37. 37.I thought of a number, added 4 and then doubled it. I got 26. What was my number?
  38. 38.7 × 9 =
  39. 39.Double 45 =
  40. 40.48 × 4 =

Answer key

  1. 105
  2. Tuesday
  3. 13
  4. 45
  5. 9876543
  6. 18
  7. 7
  8. 21
  9. 196
  10. 5
  11. 7
  12. 34
  13. 4
  14. 666666666
  15. 1
  16. 27
  17. 4
  18. 208
  19. 54
  20. 600
  21. 121
  22. 6
  23. 27
  24. 88
  25. 60
  26. 25
  27. 36
  28. 9
  29. 2
  30. 396
  31. 16
  32. 94
  33. Thursday
  34. 7
  35. 2
  36. Monday
  37. 9
  38. 63
  39. 90
  40. 192

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