47 grade 24`=se impart gradele 47 grade:2=23 grade ramane un grad si il transformam in min(60`) apoi impartim acele 60` la 2=30` si impartim minutele date adica 24 la 2=12` si ramane 23 grade 30` 12`=23 grade 42`
47grade 24`=(47grade:2)(24`:2)=23 grade 30` 12`=23 grade 42`
