3.15 means "three and fifteen hundredths"
= 315/100
= 33/20
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You can do it in this way, 0.015 = 315/1000200 =3/200
0.315 inches is written as a fraction. It is a fraction in decimal form rather than in the form of a ratio. However, that does not stop it being a fraction. Its equivalent, in rational form, 315/1000 inches. You can simplify this rational fraction if required.
315 = 32*5*7
3.15 x 10^8 will be 315 in decimal form.
7/8