Can you help me on #3 Please show work so I can follow it

Given:
The decimal form of 1/3 is a repeating decimal.
[tex]\frac{1}{3}=0.3333\ldots[/tex]All the multiple of 1/3 is not repeating decimals.
Example: 3 time 1/3.
[tex]\begin{gathered} \text{Let, x=}\frac{1}{3} \\ 3x=3\times\frac{1}{3}=1 \end{gathered}[/tex]So, 3 time 1/3 is not the repreating decimal.