10 mm = 1.0 cm
5 mm = 0.5 cm
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It is: 5/10 = 1/2
a decimal fraction means a fraction that changes into a decimal or a decimal that changes into a farction
You need to know how many cm there are in a whole meter.Then divide 20 by that number, and you'll have your fraction.
0.21 is a decimal fraction.
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.