It's a multiplication word. E.g. The columns/height=5 and the rows/width=6 equals 30 (5x6=30). Or columns/height=3 and rows/width=2, so 3x2=6.
It's not division. I'll explain why if you ask.
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array
Yes. An abacus is like an array so therefore it is possible to use it for multiplication up to the number of rods, and is able to be used for division by separating the beads.
multiplication: the opposite (division) property is factoring
you yes
One possibility is the "answer".