(1)18.3-6.32-10.68 =18.3-(6.32+10.68) =18.3-17 =1.3 (2)58.97+7.6-42.57 =(58.97-42.57)+7.6 =16.4+7.6 =24 (3)24.25+39.33-18.33 =24.25+(29.33-18.33) =24.25+11 =35.25 (4)18.48+26.88-12.36 =(18.48-12.36)+26.88 =6.12+26.88 =33 (5)39.72-15.56-12.44 =39.72-(15.56+12.44) =39.72-28 =11.72 (6)11.91+9.91-6.91 =11.91+(9.91-6.91) =11.91+3 =14.91 (7)85.37+56.36-76.37 =(85.37-76.37)+56.36 =9+56.36 =65.36