Here we will convert the number 42.09 to a fraction.
42.09 is the same as 42.09/1, because 42.09 divided by 1 is 42.09.
Therefore, we can multiply both the numerator and denominator in 42.09/1 by 100 to get rid of the decimal point and make it into a fraction as follows:
42.09/1 x 100/100 = 4209/100
Then, we simplify the fraction if necessary and we have our answer:
42.09 = 42 9/100
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