Explicație pas cu pas:
40° + 50° = 90°
24°38' + 17°18' = (24 + 18)°(38 + 18)' = 41°56'
56°43' - 21°18' = (56 - 21)°(43 - 18)' = 35°25'
25° × 4 = (25 × 4)° = 100°
108° + 72° = (108 + 72)° = 180°
44°30' + 16°20' = (44 + 16)°(30 + 20)' = 60°50'
70°52' - 20°12' = (70 - 20)°(52 - 12)' = 50°40'
30°20' × 3 = (30 × 3)°(20 × 3)' = 90°60' = (90 + 1)° = 91°
90° - 30° = (90 - 30)° = 60°
57°35 + 42°25 = (57 + 42)°(35 + 25)' = 99°60' = (99 + 1)° = 100°
88°30' - 43°50' = (87 + 1)°30' - 43°50' = 87°90' - 43°50' = (87 - 43)°(90 - 50)' = 44°40'
90° ÷ 3 = (90 ÷ 3)° = 30°
180° - 50° = 130°
60°40' + 50°50' = (60 + 50)°(40 + 50)' = 110°90' = 110°(60 + 30)' = (110 + 1)°30' = 111°30'
90° - 32°30' = (89 + 1)° - 32°30' = 89°60' - 32°30' = (89 - 32)°(60 - 30)' = 57°30'
90° ÷ 4 = (88 + 2)° ÷ 4 = 88°120' ÷ 4 = (88 ÷ 4)°(120 ÷ 4)' = 22°30'
