7/21 reduces to 1/3
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Fractions and integers can be equivalent, but they are different things. An integer can be written as a fraction (7 = 7/1 or 21/3) but in its simplified form it is not a fraction.
The fraction equivalent to 7 is 7/1 while the fraction equivalent to 8 is 8/1.
0.021 = 21/1000 in fraction
7/21 or 9/27 are both equivalent fractions to 1/3.... there are many others !
An equivalent fraction to 0.42 is 21/50.