1) 21⁰34¹ + 12⁰ 28¹ = 33⁰62¹= 34⁰2¹
2) 51⁰12¹ - 13⁰38¹ = 50⁰72¹ - 13⁰38¹ = 37⁰34¹
3) 148⁰3¹-63⁰27¹ = 147⁰63¹ - 63⁰27¹ = 84⁰36¹
4) 64⁰46¹+75⁰57¹ = 139⁰103¹ = 140⁰43¹
5) 20⁰00¹5¹¹-5⁰5¹20¹¹=19°59¹65¹¹=5°5¹20¹¹=14°54¹45¹¹
6) 28¹41¹¹+3°31¹49¹¹ = 3⁰59¹90¹¹ = 4⁰30¹¹