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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 363 · 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 × 3 = ?7 — what is the missing digit?
  2. 2.Take 30 and take away the sum of its digits. What do you get?
  3. 3.9 × 2 = 1? — what is the missing digit?
  4. 4.Magic square (every row, column and diagonal has the same total): 14 35 20 | 29 23 17 | ? 11 32. What is the missing number?
  5. 5.9 × 8 =
  6. 6.12345679 × 45 =
  7. 7.Half of 16 =
  8. 8.You have 6 coins. Each coin is ₹1 or ₹2, and together they make ₹8. How many ₹2 coins do you have?
  9. 9.12 × 9 + 3 =
  10. 10.13 × 1000 =
  11. 11.1 + 2 + 3 + … + 69 =
  12. 12.What comes next? 1, 4, 9, 16, ? (a) 23 (b) 25 (c) 26 (d) 27
  13. 13.What comes next? 25, 36, 49, 64, ? (a) 82 (b) 79 (c) 81 (d) 83
  14. 14.891 + 198 =
  15. 15.495 + 594 =
  16. 16.2 × 9 =
  17. 17.If today is Monday, what day will it be after 24 days? (a) Friday (b) Sunday (c) Thursday (d) Wednesday
  18. 18.In 6 years a boy will be 18 years old. How old was he 3 years ago?
  19. 19.1234 × 8 + 4 =
  20. 20.Do the 1089 trick with 729: reverse and subtract, then reverse that answer and add. What do you get?
  21. 21.70?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.Magic square (every row, column and diagonal has the same total): 19 34 13 | 16 22 28 | ? 10 25. What is the missing number?
  23. 23.650 × 10 =
  24. 24.9 × 5 =
  25. 25.Think of 2. Multiply it by 4, then add 4. What number do you end with?
  26. 26.7 × 9 =
  27. 27.122? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.If today is Saturday, what day will it be after 25 days? (a) Tuesday (b) Thursday (c) Wednesday (d) Saturday
  29. 29.4?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.9 × 8 = 7? — what is the missing digit?
  31. 31.727? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.Half of 184 =
  33. 33.If today is Sunday, what day will it be after 74 days? (a) Friday (b) Sunday (c) Thursday (d) Wednesday
  34. 34.Magic square (every row, column and diagonal has the same total): 7 8 3 | 2 6 10 | 9 4 ?. What is the missing number?
  35. 35.In 6 years a boy will be 17 years old. How old was he 6 years ago?
  36. 36.A girl is 7 years old and her brother is 4 years older. How old will her brother be in 8 years?
  37. 37.Magic square (every row, column and diagonal has the same total): 15 30 27 | 36 24 12 | 21 ? 33. What is the missing number?
  38. 38.Take 71 and take away the sum of its digits. What do you get?
  39. 39.Think of 5. Multiply it by 3, then add 1. What number do you end with?
  40. 40.462 × 10 =

Answer key

  1. 2
  2. 27
  3. 8
  4. 26
  5. 72
  6. 555555555
  7. 8
  8. 2
  9. 111
  10. 13000
  11. 2415
  12. 25
  13. 81
  14. 1089
  15. 1089
  16. 18
  17. Thursday
  18. 9
  19. 9876
  20. 1089
  21. 1
  22. 31
  23. 6500
  24. 45
  25. 12
  26. 63
  27. 4
  28. Wednesday
  29. 2
  30. 2
  31. 2
  32. 92
  33. Thursday
  34. 5
  35. 5
  36. 19
  37. 18
  38. 63
  39. 16
  40. 4620

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