4 can not be reduced because it is a whole number.
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The decimal .4 is the fraction 4/10 or reduced 2/5.
The fraction 4/15 cannot be reduced any more.
To reduce a fraction you would just simplify the fraction to its lowest terms. For example: 20/5 reduced would be 4. Another example: 4/8 reduced would equal 1/2.
4/15 cannot be further reduced.
As a mixed number it is 67/5 As an un-reduced fraction it is 13 4/10 And as a reduced fraction it is 13 2/5