Ответ:\(20:10=2\); \(100:20=5\); \(60:30=2\).\(6\cdot10=60\); \(8\cdot10=80\); \(70:10=7\).\(100:50=2\); \(10\cdot40=400\); \(200:10=20\).\(10\cdot8=80\); \(20\cdot20=400\); \(90:30=3\).