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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 18 · 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. 1.9 × 7 = 6? — what is the missing digit?
  2. 2.A girl is 8 years old and her brother is 3 years older. How old will her brother be in 4 years?
  3. 3.Take 68 and take away the sum of its digits. What do you get?
  4. 4.Think of 4. Multiply it by 5, then add 2. What number do you end with?
  5. 5.If today is Wednesday, what day was it 45 days ago? (a) Wednesday (b) Monday (c) Sunday (d) Saturday
  6. 6.1234 × 8 + 4 =
  7. 7.Double 31 =
  8. 8.396 + 693 =
  9. 9.If today is Tuesday, what day was it 30 days ago? (a) Saturday (b) Sunday (c) Wednesday (d) Monday
  10. 10.3 × 9 =
  11. 11.If today is Friday, what day will it be after 30 days? (a) Monday (b) Saturday (c) Sunday (d) Wednesday
  12. 12.Double 66 =
  13. 13.Magic square (every row, column and diagonal has the same total): 15 36 21 | 30 24 18 | 27 ? 33. What is the missing number?
  14. 14.Magic square (every row, column and diagonal has the same total): 8 6 ? | 18 10 2 | 4 14 12. What is the missing number?
  15. 15.297 + 792 =
  16. 16.Magic square (every row, column and diagonal has the same total): 10 31 16 | 25 19 13 | 22 ? 28. What is the missing number?
  17. 17.32 × 4 =
  18. 18.Take 381. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  19. 19.Magic trick! Think of 5. Double it, add 8, halve it, then take away 5. What number do you get?
  20. 20.55 × 100 =
  21. 21.111111 × 111111 =
  22. 22.Odd one out: which number is NOT in the 8 times table? (a) 24 (b) 40 (c) 29 (d) 32
  23. 23.The 2nd of a month is a Saturday. What day is the 18th of the same month? (a) Tuesday (b) Sunday (c) Monday (d) Thursday
  24. 24.Magic square (every row, column and diagonal has the same total): 11 21 7 | 9 13 17 | 19 ? 15. What is the missing number?
  25. 25.11 × 11 =
  26. 26.1 + 3 + 5 + … + 31 =
  27. 27.Magic trick! Think of 8. Double it, add 10, halve it, then take away 8. What number do you get?
  28. 28.Half of 156 =
  29. 29.54 × 4 =
  30. 30.What comes next? 11, 17, 23, 29, ? (a) 29 (b) 36 (c) 41 (d) 35
  31. 31.34 × 4 =
  32. 32.792 + 297 =
  33. 33.123 × 9 + 4 =
  34. 34.If today is Saturday, what day will it be after 87 days? (a) Wednesday (b) Tuesday (c) Friday (d) Monday
  35. 35.If today is Wednesday, what day was it 30 days ago? (a) Tuesday (b) Sunday (c) Thursday (d) Monday
  36. 36.I thought of a number, multiplied it by 3 and added 7. I got 13. What was my number?
  37. 37.In 4 years a boy will be 16 years old. How old was he 2 years ago?
  38. 38.123456 × 9 + 7 =
  39. 39.A father is 30 years old and his son is 8. How old was the father when the son was born?
  40. 40.57 × 4 =

Answer key

  1. 3
  2. 15
  3. 54
  4. 22
  5. Sunday
  6. 9876
  7. 62
  8. 1089
  9. Sunday
  10. 27
  11. Sunday
  12. 132
  13. 12
  14. 16
  15. 1089
  16. 7
  17. 128
  18. 198
  19. 4
  20. 5500
  21. 12345654321
  22. 29
  23. Monday
  24. 5
  25. 121
  26. 256
  27. 5
  28. 78
  29. 216
  30. 35
  31. 136
  32. 1089
  33. 1111
  34. Tuesday
  35. Monday
  36. 2
  37. 10
  38. 1111111
  39. 22
  40. 228

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