Multiples

If $n$ is an integer, the numbers $0n$, $1n$, $2n$, $3n$, $4n$ and so on are multiples of $n$.

For example, multiples of $70$ include $0$, $70$, $140$, $210$, $280$ and so on. Multiples can also be negative, but GRE does not test this concept. At least we've never seen them do so.