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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 952 · 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): 5 4 9 | 10 6 2 | ? 8 7. What is the missing number?
  2. 2.Magic square (every row, column and diagonal has the same total): ? 3 8 | 5 7 9 | 6 11 4. What is the missing number?
  3. 3.In 2 years a boy will be 11 years old. How old was he 6 years ago?
  4. 4.1 + 2 + 3 + … + 23 =
  5. 5.Magic square (every row, column and diagonal has the same total): 27 30 15 | 12 ? 36 | 33 18 21. What is the missing number?
  6. 6.150? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.I thought of a number, added 4 and then doubled it. I got 22. What was my number?
  8. 8.A father is 43 years old and his son is 9. How old was the father when the son was born?
  9. 9.If today is Friday, what day will it be after 53 days? (a) Friday (b) Monday (c) Wednesday (d) Tuesday
  10. 10.7 × 9 =
  11. 11.A father is 40 years old and his son is 7. How old was the father when the son was born?
  12. 12.9 × 2 = 1? — what is the missing digit?
  13. 13.The 8th of a month is a Friday. What day is the 29th of the same month? (a) Saturday (b) Friday (c) Thursday (d) Monday
  14. 14.1 + 3 + 5 + … + 15 =
  15. 15.26 × 4 =
  16. 16.Odd one out: which number is NOT in the 4 times table? (a) 16 (b) 30 (c) 12 (d) 20
  17. 17.Magic square (every row, column and diagonal has the same total): 16 ? 14 | 11 13 15 | 12 17 10. What is the missing number?
  18. 18.Take 856. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  19. 19.Double 56 =
  20. 20.9 × 4 = 3? — what is the missing digit?
  21. 21.1 + 3 + 5 + … + 17 =
  22. 22.27 × ? = 2700
  23. 23.749? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.1 × 9 =
  25. 25.6?20 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.Do the 1089 trick with 478: reverse and subtract, then reverse that answer and add. What do you get?
  27. 27.I thought of a number, multiplied it by 2 and added 9. I got 35. What was my number?
  28. 28.9 × 10 = ?0 — what is the missing digit?
  29. 29.41 × 4 =
  30. 30.45 × 4 =
  31. 31.The ages of two twins add up to 10. How old is each twin?
  32. 32.Take 301. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  33. 33.If today is Friday, what day will it be after 24 days? (a) Sunday (b) Thursday (c) Monday (d) Tuesday
  34. 34.1 + 3 + 5 + … + 49 =
  35. 35.What comes next? 36, 49, 64, 81, ? (a) 100 (b) 98 (c) 102 (d) 101
  36. 36.If today is Sunday, what day will it be after 26 days? (a) Friday (b) Thursday (c) Monday (d) Saturday
  37. 37.111111 × 111111 =
  38. 38.15 × 4 =
  39. 39.18 × 4 =
  40. 40.9 × 3 =

Answer key

  1. 3
  2. 10
  3. 3
  4. 276
  5. 24
  6. 3
  7. 7
  8. 34
  9. Tuesday
  10. 63
  11. 33
  12. 8
  13. Friday
  14. 64
  15. 104
  16. 30
  17. 9
  18. 198
  19. 112
  20. 6
  21. 81
  22. 100
  23. 7
  24. 9
  25. 1
  26. 1089
  27. 13
  28. 9
  29. 164
  30. 180
  31. 5
  32. 198
  33. Monday
  34. 625
  35. 100
  36. Friday
  37. 12345654321
  38. 60
  39. 72
  40. 27

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