Reference for Bava Metzia 127:1

בעישורייתא וחומשייתא

In [denominations of] tens or fives.<span class="x" onmousemove="('comment',' They used to count in fives and tens (Tosaf.). Now, if the amount should have been e.g., fifty, and it was fifty-five or sixty, the lender may have mistakenly counted eleven fives instead of ten, or six tens instead of five; but if it were fifty-two or-three etc., it is impossible that it should have been an error. ');">¹</span>

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