.665 as a Fraction
Writing .665 as a fraction requires us to multiply 0.665/1 by 1000/1000 which will result in 665/1000. Simplifying further we get the final answer: 133/200.

What Is .665 as a Fraction?
.665 as a fraction in lowest terms is 133/200. Quick tip: to verify the answer is correct, use a calculator to divide 133 by 200 and you should get 0.665.
How to Work Out .665 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 .665:
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Turn 0.665 into a fraction dividing it by 1.
0.665 1
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To get rid of the decimal point, multiply the numerator and denominator by 1000. Why 1000? .665 has three digits after the decimal point, so you need to multiply by 1 followed by 3 zeros (1000).
0.665 1×1000 1000=665 1000
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Divide 665 and 1000 by their Greatest Common Divisor (GCD), which in this case is 5.
665 ÷ 5 1000 ÷ 5
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In conclusion, .665 as a fraction in simplest form is:
133 200