Ответ:

  1. \(356+475=831\);
  2. \(564+236=800\);
  3. \(764-596=168\);
  4. \(509-236=273\);
  5. \(348\cdot2=696\);
  6. \(123\cdot3=369\);
  7. \(848:4=212\);
  8. \(546:3=182\).