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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 891 · 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.Half of 126 =
  2. 2.1 + 2 + 3 + … + 58 =
  3. 3.Double 91 =
  4. 4.The 9th of a month is a Friday. What day is the 21st of the same month? (a) Tuesday (b) Thursday (c) Saturday (d) Wednesday
  5. 5.51 × 4 =
  6. 6.41 × 4 =
  7. 7.28 × 4 =
  8. 8.12345679 × 9 =
  9. 9.1234 × 8 + 4 =
  10. 10.37 × 15 =
  11. 11.9 × 1 =
  12. 12.Double 31 =
  13. 13.19 × ? = 19000
  14. 14.?92 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.23 × 1000 =
  16. 16.The 4th of a month is a Wednesday. What day is the 18th of the same month? (a) Saturday (b) Tuesday (c) Wednesday (d) Thursday
  17. 17.Double 22 =
  18. 18.Magic square (every row, column and diagonal has the same total): 18 4 14 | 8 12 16 | ? 20 6. What is the missing number?
  19. 19.Half of 196 =
  20. 20.The 3rd of a month is a Monday. What day is the 17th of the same month? (a) Monday (b) Thursday (c) Tuesday (d) Sunday
  21. 21.9 × 6 =
  22. 22.72 × 100 =
  23. 23.38 × 1000 =
  24. 24.693 + 396 =
  25. 25.2 × 9 =
  26. 26.?269 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.6 × 9 =
  28. 28.Magic square (every row, column and diagonal has the same total): 6 21 18 | 27 15 3 | 12 ? 24. What is the missing number?
  29. 29.I thought of a number, added 3 and then doubled it. I got 12. What was my number?
  30. 30.9 × 8 = ?2 — what is the missing digit?
  31. 31.123456 × 8 + 6 =
  32. 32.12345679 × 72 =
  33. 33.9 × 2 =
  34. 34.1 + 3 + 5 + … + 33 =
  35. 35.12345 × 9 + 6 =
  36. 36.Magic square (every row, column and diagonal has the same total): 28 7 22 | 13 19 25 | 16 31 ?. What is the missing number?
  37. 37.The 7th of a month is a Sunday. What day is the 20th of the same month? (a) Friday (b) Tuesday (c) Sunday (d) Saturday
  38. 38.43 × 4 =
  39. 39.60 × 4 =
  40. 40.Magic square (every row, column and diagonal has the same total): 7 ? 9 | 8 6 4 | 3 10 5. What is the missing number?

Answer key

  1. 63
  2. 1711
  3. 182
  4. Wednesday
  5. 204
  6. 164
  7. 112
  8. 111111111
  9. 9876
  10. 555
  11. 9
  12. 62
  13. 1000
  14. 7
  15. 23000
  16. Wednesday
  17. 44
  18. 10
  19. 98
  20. Monday
  21. 54
  22. 7200
  23. 38000
  24. 1089
  25. 18
  26. 1
  27. 54
  28. 9
  29. 3
  30. 7
  31. 987654
  32. 888888888
  33. 18
  34. 289
  35. 111111
  36. 10
  37. Saturday
  38. 172
  39. 240
  40. 2

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