Only in the ones column. Prime numbers aren't multiples of anything but one and themselves.
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It will take six. 2 x 2 x 2 x 2 x 2 x 2 = 64
That's an infinite list.
3 x 5 x 5 = 75
You show your remainder by circling the equal group of numbers and then the remainder stays the same you don't circle it.
Answer: The associative property involves three numbers, not two. Of course, you can use one of the numbers more than once. For example, show, by calculation, that (2 x 2) x -2 = 2 x (2 x -2).