Ответ:

  1. \(365+137=502\);
  2. \(129+65=194\);
  3. \(624+376=1000\);
  4. \(536-284=252\);
  5. \(412-153=259\);
  6. \(821-699=122\);
  7. \(383\cdot4=1532\);
  8. \(52\cdot8=416\);
  9. \(134\cdot6=804\);
  10. \(207:3=69\);
  11. \(638:2=319\);
  12. \(800:5=160\).