(5 7/8 + 1 5/6)- 5 7/8

(5 7/8 + 1 5/6) - 5 7/8= (5 42/48 + 1 40/48) - 5 7/8= 6 82/48 - 5 7/8= 6 82/48 - 5 42/48 = 1 42/48 = 1 7/8