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4.15 is a rational number because it can be expressed in the form of a/b where b is not equal to 0.

e.g. 4.15 = 415/100 which is in the form of a/b.

4.15 can be written in many ways: 415/100 or 83/20 or 830/200 or 415000/100000 or 4150/1000 etc. but each fraction is in the form of a/b.

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