en_tn_lite_do_not_use/lev/27/15.md

he must add a fifth of its value to its redemption price

A "fifth" is a part of something that is divided into five equal parts. Alternate translation: "he must divide the value of the house into five equal parts, add the amount equal to one of those parts, and pay all of it" (See: rc://en/ta/man/jit/translate-fraction)