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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 524 · 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. 1.16 × 4 =
  2. 2.A father is 41 years old and his son is 12. How old was the father when the son was born?
  3. 3.A girl is 9 years old and her brother is 4 years older. How old will her brother be in 3 years?
  4. 4.1234567 × 8 + 7 =
  5. 5.The 4th of a month is a Friday. What day is the 25th of the same month? (a) Saturday (b) Friday (c) Thursday (d) Monday
  6. 6.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
  7. 7.I thought of a number, multiplied it by 3 and added 6. I got 33. What was my number?
  8. 8.The 5th of a month is a Saturday. What day is the 23rd of the same month? (a) Thursday (b) Tuesday (c) Saturday (d) Wednesday
  9. 9.Magic trick! Think of 5. Double it, add 4, halve it, then take away 5. What number do you get?
  10. 10.Double 57 =
  11. 11.9 × 10 = 9? — what is the missing digit?
  12. 12.Magic square (every row, column and diagonal has the same total): ? 12 5 | 6 8 10 | 11 4 9. What is the missing number?
  13. 13.Magic square (every row, column and diagonal has the same total): 24 3 18 | 9 15 21 | 12 27 ?. What is the missing number?
  14. 14.What comes next? 18, 20, 22, 24, ? (a) 27 (b) 24 (c) 26 (d) 28
  15. 15.I thought of a number, added 1 and then doubled it. I got 34. What was my number?
  16. 16.?258 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.If today is Friday, what day was it 52 days ago? (a) Monday (b) Friday (c) Wednesday (d) Tuesday
  18. 18.?834 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.5 × 1000 =
  20. 20.Take 300. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  21. 21.37 × 6 =
  22. 22.9 × 8 = ?2 — what is the missing digit?
  23. 23.12345679 × 63 =
  24. 24.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
  25. 25.1 + 2 + 3 + … + 19 =
  26. 26.37 × 3 =
  27. 27.123 × 8 + 3 =
  28. 28.9 × 8 =
  29. 29.9 × 4 = 3? — what is the missing digit?
  30. 30.A father is 34 years old and his son is 13. How old was the father when the son was born?
  31. 31.1 × 9 =
  32. 32.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
  33. 33.What comes next? 4, 8, 16, 32, ? (a) 56 (b) 48 (c) 65 (d) 64
  34. 34.Magic square (every row, column and diagonal has the same total): ? 19 9 | 15 11 7 | 13 3 17. What is the missing number?
  35. 35.Do the 1089 trick with 119: reverse and subtract, then reverse that answer and add. What do you get?
  36. 36.Half of 184 =
  37. 37.Half of 178 =
  38. 38.9 × 4 =
  39. 39.If today is Sunday, what day was it 57 days ago? (a) Tuesday (b) Sunday (c) Saturday (d) Friday
  40. 40.1 + 2 + 3 + … + 66 =

Answer key

  1. 64
  2. 29
  3. 16
  4. 9876543
  5. Friday
  6. 297
  7. 9
  8. Wednesday
  9. 2
  10. 114
  11. 0
  12. 7
  13. 6
  14. 26
  15. 16
  16. 3
  17. Tuesday
  18. 3
  19. 5000
  20. 297
  21. 222
  22. 7
  23. 777777777
  24. 594
  25. 190
  26. 111
  27. 987
  28. 72
  29. 6
  30. 21
  31. 9
  32. 396
  33. 64
  34. 5
  35. 1089
  36. 92
  37. 89
  38. 36
  39. Saturday
  40. 2211

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