Commentary for Avodah Zarah 18:2

אמר רב הונא בריה דרב יהושע האי מאן דלא ידע כמה שני בשבוע הוא עומד ניטפי חד שתא ונחשוב כללי ביובלי ופרטי בשבועי

Huna the son of R. Joshua said: If one does not know what the year is in the sabbatical cycle of seven years he is in, let him add one year [to the years since the Destruction of the Temple] and let him reckon the hundreds as Jubilee Cycles and convert the remainder into sabbatical Cycles [of seven years each] and take two out of every hundred and add it to the years and then calculate the years of the cycle and he will know they year in the current sabbatical cycle. As a mnemonic [for adding two years for every century, think of the verse].

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