for the first part call the number as x and if it is a quotient it is a division
the algebraic expression will be
[tex]\frac{x}{3}[/tex]for the second part will be the same, but this is a multiplication instead
[tex](3x)\cdot6_{}[/tex]and on the third will be the same, a product but it will also have a substraction
[tex](6x)-2[/tex]