4 3/8 --------------- = (1 5/8 - 0,75)    

4 3/8 --------------- = (1 5/8 - 0,75) 4,375 =  ---------------  = ( 1,625 - 0,75)  4,375 = ------------------ = 0,875 = 4,375 : 0,875 =  = 5

4⅜                           ³⁵/₈                             ³⁵/₈ --------------------=--------------------------=----------------------= (1⅝ - 0,75)               (¹³/₈ - ¾)                (¹³/₈ - ⁶/₈)     ³⁵/₈ --------------= ³⁵/₈  : ⅞= ³⁵/₈ * ⁸/₇= 5 ⅞   Pozdrawiam M:)