67 De cantare

Item cantare valet libras \({1~~\phantom{1}7~~16 \over 4~~12~~20}\) 21, et queratur quantum valeant

② £ ℞ 20957   \({1~~\phantom{1}7~~16 \over 4~~12~~20}\) 21 100 pensa per 11 ⑨ ⑦ 18324 \({0~~3~~7~~\phantom{1}9~~\phantom{1}0~~\phantom{1}8~~\phantom{1}5~~10 \over 3~~7~~8~~10~~10~~10~~12~~20}\) 9 \({1~~2~~\phantom{1}7 \over 7~~5~~12}\) 43

¹³⁴ rotuli \({1~~2~~\phantom{1}7 \over 7~~5~~12}\) 43, hoc est rotuli 43 et uncie \({1 \over 7}\) \({2 \over 5}\) 7. Multiplica igitur, questione¹³⁵ descripta, 21 per suam virgulam; erunt 20957. Item multiplica rotulos 43 per 12 et adde 7, que per 5 et adde 2, que per 7 et adde multiplicationem de uno quod est super 7 in 5: 68 erunt 18324, que multiplica per 20957; erunt 384016068, que divide [S:43v] per 100 et per fractiones que sunt sub virgulis amborum aliorum¹³⁶ numerorum, optime scilicet aptatas: exibunt \({0~~3~~7~~\phantom{1}9~~\phantom{1}0~~\phantom{1}8~~\phantom{1}5~~10 \over 3~~7~~8~~10~~10~~10~~12~~20}\) 9, ut in hac descriptione cernitur, quorum pensa per 11 est 7.