Please note that Mommsen uses the AUC chronology (Ab Urbe Condita), i.e. from the founding of the City of Rome. You can use this reference table to have the B.C. dates
From: The History of Rome, by Theodor Mommsen
Translated with the sanction of the author by William Purdie Dickson
On the other hand in Varro the Greek training of youth appears already in all its completeness: by the side of the course of grammar, rhetoric, and philosophy, which had been introduced at an earlier period into Italy, we now find the course which had longer remained distinctively Greek, of geometry, arithmetic, astronomy, and music.(3)
3. These form, as is well known, the so-called seven liberal arts, which, with this distinction between the three branches of discipline earlier naturalized in Italy and the four subsequently received, maintained their position throughout the middle ages.
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Reference address : https://www.ellopos.net/elpenor/rome/5-12-religion-culture-literature-art.asp?pg=9