Yes.
Any number that can be written as one integer over a non-zero integer is a rational number.
2 3/5 = (2×5+3)/5 = 13/5 which is the form of one integer over a non-zero integer, thus it is rational.
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the square root of 2 fifths of irrational is 0.565685425
1
Two fifths is bigger.
2. 3/5
1 = 5 fifths 2 = 10 fifths 3 = 15 fifths 4 = 20 fifths