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You compare the integer parts first.
Both decimal numbers are equivalent
Since the integer parts are the same, compare the decimals one at a time until you find corresponding decimals that are different. That is, compare the first digit after the decimal point; if those are equal, compare the second digit after the decimal point, etc.
When you multiply decimals, you just ignore the decimal until the end, then, to find the amount of decimal places in your answer, you add the amount of decimal places in both your factors
If you don't know their equivalence, then you can either get a common denominator, and compare the numerators. Or you can divide and convert them all to decimal form and then compare.