1. a) 21 grade 15 min + 42 grade 37 min= 63 grade 52 min
b) 28 grade23 min - 17 grade 38 min=
27 grade 83 min - 17 grade 38 min = 10 grade 45 min
c) 12 grade 15 min * 6 = 72 grade 90 min
d) 27 grade 26 min :2= 13,5 grade 13 min
4. BOC= 90 grade - ( AOB+COD ) = 90 grade- ( 35+25 ) =90 grade - 60 grade= 30 grade
6. a) Suplementul : 180- 125 grade 46 min = 179 grade 59 min 60 sec - 125 grade 46 min = 54 grade 13 min 60 sec= 54 grade 14 min
b) Complementul : 90 grade - 67 grade 45 min = 89 grade 59 min 60 sec - 67 grade 45 min = 22 grade 14 min 60 sec = 22 grade 15 min
