172 De⁴⁵⁰ rotulis venditis pro granis, cum queritur merces tarenorum

Item rotuli \({1 \over 4}\) \({1 \over 3}\) 3 pro granis \({1 \over 6}\) \({2 \over 5}\) 13; quot rotulos habuero pro

407 gr. 43 ℞ \({1~~2~~13 \over 6~~5~~20}\) \({1 \over 4}\) \({1 \over 3} 3\) pensa est 3 per 13   639   \({1 \over 8}\) \({2 \over 7}\) 11 \({3~~3~~12~~3 \over 7~~11~~37~~12} 60\)

⁴⁵¹ tarenis \({1 \over 8}\) \({2 \over 7}\) 11? Fac partes unius tareni de granis \({1 \over 6}\) \({2 \over 5}\) 13; erunt \({1~~2~~13 \over 6~~5~~20}\), et describes questionem sicut⁴⁵² inferius cernitur⁴⁵³, et multiplicabis \({1 \over 4}\) \({1 \over 3}\) 3 per \({1 \over 8}\) \({2 \over 7}\) 11, et divides per \({1~~2~~13 \over 6~~5~~20}\): exibunt rotuli \({3~~3~~12~~\phantom{1}3 \over 7~~11~~37~~12}\) 60.

173 Item \({3 \over 4}\) unius rotuli pro \({4 \over 5}\) unius bizantii; quantum habuero pro \({6 \over 7}\) unius bizantii? Describe

b. ℞ \({4 \over 5}\) \({3 \over 4}\) \({6 \over 7}\) \({0~~3~~6 \over 2~~7~~8}\)

⁴⁵⁴ questionem et multiplica 3 que sunt super 4 per 6 que sunt super 7; erunt 18, que per 5 que sunt sub virgula superiori; erunt 90, que divide per 4 que sunt super 5 et per 4 et per 7 que sunt sub aliis [R:69r] virgulis, idest per \({1~~0~~0 \over 2~~7~~8}\): exibunt \({3~~6 \over 7~~8}\)⁴⁵⁵ unius rotuli.