It is a number expressed in decimal form.
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It already is decimal expression of one-third.
It is the decimal expression of a positive rational and real number.
Subtract one expression from the other. If they are equivalent, the answer is zero.
21 over 40 is irreducible as a fraction expression. 21 over 40 is 0.525 as a decimal expression.
It terminates or has a infinite repeating expression.