There is no number related to the original (as implied by "its what") that will do.
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hi
The sum of a single number is itself. So the only number whose sum equals 2 is 2.
it is 10 times larger (of the number that was multiplied by 10 or added a zero at the end)
kl
It is when the answer, when 2 things are multiplied, is the same as when they are added. For instance, 2*2=2+2