1°=60′,1′=60″ 25.12°=(25.12×60)′ =1507.2′ =1507′+0.2′ =1507′+(0.2×60)″ =1507′+12″ =1507′12″ 25°20′+40°55′=65°75′ =65°+75′ =65°+(75÷60)° =65°+1.25° =66.25°
