It equals one half:
0.5=1/2
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0.3 = 3/10
0.2 is 1/5 as a fraction, and 20% as a percentage.
Point nought nought two or point zero zero two.
nought point nought one seven or seventeen one thousandths
When saying the number 0.125, you would say "nought" (or "zero") "point one two five".