Salutare!
[tex]\bf \dfrac{1}{4} \cdot 16 =[/tex]
[tex]\bf \dfrac{1}{\not4} \cdot \not16 =[/tex]
[tex]\bf \dfrac{1}{1} \cdot 4=[/tex]
[tex]\bf 1 \cdot 4=[/tex]
[tex]\boxed{\bf4}[/tex]
