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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 762 · 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.If today is Monday, what day was it 27 days ago? (a) Monday (b) Friday (c) Wednesday (d) Tuesday
  2. 2.32 × 4 =
  3. 3.Take 217. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  4. 4.Magic square (every row, column and diagonal has the same total): ? 7 2 | 1 5 9 | 8 3 4. What is the missing number?
  5. 5.In 2 years a boy will be 11 years old. How old was he 7 years ago?
  6. 6.What comes next? 17, 20, 23, 26, ? (a) 32 (b) 26 (c) 29 (d) 30
  7. 7.If today is Thursday, what day was it 21 days ago? (a) Friday (b) Thursday (c) Sunday (d) Wednesday
  8. 8.9 × 4 = ?6 — what is the missing digit?
  9. 9.9 × 7 =
  10. 10.50?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.21 × 4 =
  12. 12.Take 17 and take away the sum of its digits. What do you get?
  13. 13.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
  14. 14.49 × 4 =
  15. 15.A girl is 11 years old and her brother is 3 years older. How old will her brother be in 7 years?
  16. 16.10 × 9 =
  17. 17.If today is Wednesday, what day will it be after 42 days? (a) Wednesday (b) Saturday (c) Tuesday (d) Thursday
  18. 18.Magic square (every row, column and diagonal has the same total): 23 8 29 | 26 20 14 | 11 ? 17. What is the missing number?
  19. 19.What comes next? 8, 11, 14, 17, ? (a) 17 (b) 21 (c) 23 (d) 20
  20. 20.Magic square (every row, column and diagonal has the same total): 7 ? 11 | 12 8 4 | 5 10 9. What is the missing number?
  21. 21.6 × 9 =
  22. 22.8 × 1000 =
  23. 23.What comes next? 5, 10, 20, 40, ? (a) 70 (b) 60 (c) 80 (d) 81
  24. 24.What comes next? 1, 2, 4, 8, ? (a) 16 (b) 12 (c) 17 (d) 14
  25. 25.9 × 2 = 1? — what is the missing digit?
  26. 26.Double 35 =
  27. 27.Double 34 =
  28. 28.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
  29. 29.If today is Tuesday, what day will it be after 31 days? (a) Thursday (b) Saturday (c) Friday (d) Monday
  30. 30.Take 44 and take away the sum of its digits. What do you get?
  31. 31.37 × 4 =
  32. 32.Magic trick! Think of 16. Double it, add 12, halve it, then take away 16. What number do you get?
  33. 33.If today is Friday, what day will it be after 55 days? (a) Friday (b) Wednesday (c) Thursday (d) Sunday
  34. 34.The 4th of a month is a Wednesday. What day is the 29th of the same month? (a) Wednesday (b) Sunday (c) Saturday (d) Monday
  35. 35.Take 80 and take away the sum of its digits. What do you get?
  36. 36.33 × ? = 33000
  37. 37.9 × 2 =
  38. 38.123456 × 8 + 6 =
  39. 39.9 × 10 = ?0 — what is the missing digit?
  40. 40.1 + 2 + 3 + … + 61 =

Answer key

  1. Tuesday
  2. 128
  3. 495
  4. 6
  5. 2
  6. 29
  7. Thursday
  8. 3
  9. 63
  10. 7
  11. 84
  12. 9
  13. 693
  14. 196
  15. 21
  16. 90
  17. Wednesday
  18. 32
  19. 20
  20. 6
  21. 54
  22. 8000
  23. 80
  24. 16
  25. 8
  26. 70
  27. 68
  28. 495
  29. Friday
  30. 36
  31. 148
  32. 6
  33. Thursday
  34. Sunday
  35. 72
  36. 1000
  37. 18
  38. 987654
  39. 9
  40. 1891

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