Left out 9 x 5, though it is a duplicate. From further investigation, 8 should also be possible using more fractions, since 45/8 = 5.625. This would require 8 x (5, 37, 30), given that 0.625x60=37.5, i.e., 37, 30.
Before the development of notation, it is clear that math was still being done rhetorically, in the fashion of Babylonian algebra using word...
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