There are an infinite number of them and there are not enough electrons in the whole universe to list them all.
No.
12, 24, 36
Yes, it should be non-zero; if you multiply both sides by zero you wipe out the equation.
It is: 3*4 = 12
3,6,9
In division by three, possible nonzero remainders are 1 and 2.
Bob Dorough and Blind Melon sing three is the magic number. It talks about three being a magic number. It multiplies by threes and then multiplies backwards from three times ten.
4 8 12
Three. All nonzero digits are significant.
Three - all nonzero digits are significant.
Three - all nonzero digits are significant.
Three. All nonzero digits are significant.