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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 681 · 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 × 9 =
  2. 2.9 × 5 = ?5 — what is the missing digit?
  3. 3.1 + 2 + 3 + … + 45 =
  4. 4.Magic square (every row, column and diagonal has the same total): 28 7 22 | 13 19 ? | 16 31 10. What is the missing number?
  5. 5.Magic square (every row, column and diagonal has the same total): 14 7 12 | 9 11 13 | 10 ? 8. What is the missing number?
  6. 6.In 2 years a boy will be 10 years old. How old was he 4 years ago?
  7. 7.What comes next? 3, 6, 12, 24, ? (a) 49 (b) 42 (c) 48 (d) 36
  8. 8.If today is Saturday, what day will it be after 47 days? (a) Wednesday (b) Friday (c) Thursday (d) Sunday
  9. 9.12345678 × 9 + 9 =
  10. 10.2 × 9 =
  11. 11.Half of 112 =
  12. 12.Take 47 and take away the sum of its digits. What do you get?
  13. 13.What comes next? 20, 28, 36, 44, ? (a) 60 (b) 52 (c) 53 (d) 44
  14. 14.What comes next? 4, 8, 16, 32, ? (a) 65 (b) 64 (c) 48 (d) 56
  15. 15.9 × 8 = ?2 — what is the missing digit?
  16. 16.I thought of a number, multiplied it by 2 and added 4. I got 12. What was my number?
  17. 17.If today is Wednesday, what day will it be after 38 days? (a) Sunday (b) Tuesday (c) Saturday (d) Friday
  18. 18.Take 24 and take away the sum of its digits. What do you get?
  19. 19.Magic square (every row, column and diagonal has the same total): 15 30 9 | 12 18 24 | 27 ? 21. What is the missing number?
  20. 20.18 × 4 =
  21. 21.44?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.9 × 4 = 3? — what is the missing digit?
  23. 23.Take 26 and take away the sum of its digits. What do you get?
  24. 24.12345679 × 72 =
  25. 25.140 × 10 =
  26. 26.In 3 years a boy will be 17 years old. How old was he 4 years ago?
  27. 27.50 × 4 =
  28. 28.25 × 4 =
  29. 29.A girl is 6 years old and her brother is 6 years older. How old will her brother be in 7 years?
  30. 30.Take 45 and take away the sum of its digits. What do you get?
  31. 31.9 × 2 =
  32. 32.5 × 9 =
  33. 33.I thought of a number, multiplied it by 3 and added 9. I got 36. What was my number?
  34. 34.29 × ? = 2900
  35. 35.I thought of a number, added 6 and then doubled it. I got 26. What was my number?
  36. 36.What comes next? 18, 21, 24, 27, ? (a) 31 (b) 33 (c) 30 (d) 27
  37. 37.Magic square (every row, column and diagonal has the same total): 17 7 9 | 3 ? 19 | 13 15 5. What is the missing number?
  38. 38.What comes next? 6, 10, 14, 18, ? (a) 23 (b) 22 (c) 26 (d) 18
  39. 39.123456 × 8 + 6 =
  40. 40.8 × 9 =

Answer key

  1. 81
  2. 4
  3. 1035
  4. 25
  5. 15
  6. 4
  7. 48
  8. Thursday
  9. 111111111
  10. 18
  11. 56
  12. 36
  13. 52
  14. 64
  15. 7
  16. 4
  17. Saturday
  18. 18
  19. 6
  20. 72
  21. 9
  22. 6
  23. 18
  24. 888888888
  25. 1400
  26. 10
  27. 200
  28. 100
  29. 19
  30. 36
  31. 18
  32. 45
  33. 9
  34. 100
  35. 7
  36. 30
  37. 11
  38. 22
  39. 987654
  40. 72

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