Talmud sur Yevamot 1:6

“How much is a peruṭah? One eighth of an Italic as.” It was stated: ¹⁰⁰Babli Baba meṣia‘ 44b, Tosephta Baba batra 5:11. The as is¹/₂₄ of a silver denar; the silver denar is¹/₂₄ of a gold denar¹⁰¹In Imperial coinage, the gold denar was usually counted for 25 silver denarii.. Rebbi Ḥiyya stated: “A tetradrachma is four denarii. Six silver oboli are in a denar. Two dupondii are an obolus. An obolus¹⁰²This has to read: “a dupondius”. is two as. A pondius¹⁰³This has to read: “an as.” is two semisses. An as¹⁰⁴This has to read: “a semis”. is two quadrantes¹⁰⁵Greek κοδράντης, equivalent of Roman quadrans, ¼ of an as... A semis¹⁰⁶This has to read: “a quadrans”. The final list reads: 1 denar = 6 oboli = 12 dupondii = 24 as = 48 semisses = 96 quadrantes = 192 peruṭot (confirming the tannaïtic standard of the peruṭah as ¹/₈ of an as, Mishnah Idiut 4:7). In the Roman system, the obolus appears as a weight, rather than a coin: one-sixth of a denar of 3.6 g. is two peruṭot. It turns out that a quadrans is¹/₃₂ of the above¹⁰⁷This has to read: “A peruṭah is ¹/₃₂ of an obolus.” In the entire list, the first entry in each sentence has to be replaced by the next smaller unit and למעלה by מעה..”