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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 715 · 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.Magic square (every row, column and diagonal has the same total): 29 14 17 | 8 20 32 | 23 26 ?. What is the missing number?
  2. 2.Take 13 and take away the sum of its digits. What do you get?
  3. 3.Magic square (every row, column and diagonal has the same total): 15 16 11 | 10 14 18 | ? 12 13. What is the missing number?
  4. 4.I thought of a number, multiplied it by 3 and added 1. I got 7. What was my number?
  5. 5.1 × 9 =
  6. 6.What comes next? 5, 10, 20, 40, ? (a) 70 (b) 81 (c) 60 (d) 80
  7. 7.Do the 1089 trick with 500: reverse and subtract, then reverse that answer and add. What do you get?
  8. 8.123? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.9 × 6 = 5? — what is the missing digit?
  10. 10.9 × 5 =
  11. 11.In 2 years a boy will be 10 years old. How old was he 3 years ago?
  12. 12.1 + 2 + 3 + … + 41 =
  13. 13.11111 × 11111 =
  14. 14.31 × ? = 31000
  15. 15.15 × 1000 =
  16. 16.Take 28 and take away the sum of its digits. What do you get?
  17. 17.1 + 2 + 3 + … + 37 =
  18. 18.10 × 9 =
  19. 19.Odd one out: which number is NOT in the 7 times table? (a) 42 (b) 35 (c) 43 (d) 21
  20. 20.63 × 100 =
  21. 21.1 + 2 + 3 + … + 22 =
  22. 22.1 + 2 + 3 + … + 94 =
  23. 23.40 × 4 =
  24. 24.9 × 4 = ?6 — what is the missing digit?
  25. 25.Magic trick! Think of 6. Double it, add 10, halve it, then take away 6. What number do you get?
  26. 26.Half of 44 =
  27. 27.Double 89 =
  28. 28.30?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.Think of 9. Multiply it by 2, then add 8. What number do you end with?
  30. 30.9 × 7 = ?3 — what is the missing digit?
  31. 31.53 × 4 =
  32. 32.123456 × 9 + 7 =
  33. 33.The 5th of a month is a Saturday. What day is the 17th of the same month? (a) Wednesday (b) Friday (c) Sunday (d) Thursday
  34. 34.51 × 4 =
  35. 35.859? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.9 × 6 = ?4 — what is the missing digit?
  37. 37.If today is Tuesday, what day will it be after 15 days? (a) Tuesday (b) Saturday (c) Thursday (d) Wednesday
  38. 38.If today is Monday, what day will it be after 27 days? (a) Saturday (b) Monday (c) Sunday (d) Wednesday
  39. 39.27 × 4 =
  40. 40.40 × 1000 =

Answer key

  1. 11
  2. 9
  3. 17
  4. 2
  5. 9
  6. 80
  7. 1089
  8. 3
  9. 4
  10. 45
  11. 5
  12. 861
  13. 123454321
  14. 1000
  15. 15000
  16. 18
  17. 703
  18. 90
  19. 43
  20. 6300
  21. 253
  22. 4465
  23. 160
  24. 3
  25. 5
  26. 22
  27. 178
  28. 5
  29. 26
  30. 6
  31. 212
  32. 1111111
  33. Thursday
  34. 204
  35. 5
  36. 5
  37. Wednesday
  38. Sunday
  39. 108
  40. 40000

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