By a single zero on the right hand side. Assuming of course that you are working in the tens system. In binary that would be 1010
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10 itself is a multiple of 5, so any multiple of 10 must also be a multiple of 5.
5 is not a multiple of 10. 5 is a factor of 10. 10, like all other positive integers, is both a factor and a multiple of itself.
The answer is 10.
A multiple of 10 must end in a zero
The third multiple of 10 is 1000 of course. Actually the third multiple of 10 besides 0 would be 30; 10, 20, and 30 are multiples of 10.