.321 as a Fraction
Writing .321 as a fraction requires us to multiply 0.321/1 by 1000/1000 which will result in 321/1000 - the final answer, since this fraction cannot be reduced.

What Is .321 as a Fraction?
.321 as a fraction in lowest terms is 321/1000. Quick tip: to verify the answer is correct, use a calculator to divide 321 by 1000 and you should get 0.321.
How to Work Out .321 as a Fraction
The simple steps below will help you convert a decimal into a fraction. In this example we’ll demonstrate how to write .321 as a simplified fraction:
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Turn 0.321 into a fraction dividing it by 1.
0.321 1
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To get rid of the decimal point, multiply the numerator and denominator by 1000. Why 1000? .321 has three digits after the decimal point, so you need to multiply by 1 followed by 3 zeros (1000).
0.321 1×1000 1000=321 1000
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Because this fraction cannot be reduced any further, .321 as a fraction in simplest form is:
321 1000