31⁰ 40' 29" +46⁰ 24' 37" = 77⁰ 5' 6"
29"+37"=66"= 1' 6"
40'+24'=64'=1⁰ 4'
31⁰+46⁰=77⁰
77⁰+1⁰=78⁰
4'+1'=5'
exemplu pentru scadere
5⁰ 15' 25" - 2⁰ 20' 30"
4⁰ (60+15)' 25" - 2⁰ 20' 30"
4⁰ 75' 25" - 2⁰ 20' 30"
4⁰ 74' (60+25)" - 2⁰ 20' 30"
4⁰ 74' 85" - 2⁰ 20' 30"
si acum putem face scaderile
4⁰-2⁰ =2 ⁰
74'-20'=54'
85"-30"=55"
4⁰ 74' 85" - 2⁰ 20' 30" = 2⁰ 54' 55"