a decimal fraction means a fraction that changes into a decimal or a decimal that changes into a farction
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0.21 is a decimal fraction.
0.18 is a decimal. If you mean as a fraction, 0.18 is equal to 18/100, which reduces to 9/50.
A number expressed in decimal form usually is a fraction. It is simply a fraction in decimal form rather than in the form of a ratio. However, that does not stop it being a fraction. And, since it is a decimal fraction, there is not another simpler decimal form.
The decimal form of a fraction is either a terminating or recurring decimal.
9/10 fraction .9 decimal