since .05 is in the hundredths place, this means that the fraction form of this decimal is 05/100 (or just 5/100)
.005 is in the thousandths place so the fraction form of this decimal is 005/1000 (or just 5/1000)
now to make it easy to relate them, just make them both the same denominator.
.05 is the same as .050 so 5/100 is the same as 50/1000.
so now our two fractions to relate are 50/1000 and 5/1000.
5 x 10 is 50 so the first decimal (.05) is ten times the size of the second fraction (.005)