How to simplify these fractions 0.25/0.75 and 6.25/12.5

One of the easier ways of simplifying 0.25/0.75 would be to recognice that 0.25 goes into 0.75 3 times.  Thus, 0.25/0.75 = 1/3.

Similary, 6.25/12.5 = 6.25/12.50 = 1/2.

You can always convert any decimal to a fraction by "using as many zeros in the denominator as there are decimals and lose the dot atop", let's do so with these, and then simplify them,

500 dollars and its probably more than that