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To convert a decimal number to a binary number, you need to have each number be an integer. So, the first step is to make sure your fractional part really is fractional. Convert each integer to binary separately.

1 and 4/5 to binary would be this:

1 -> 1

4 -> 100

5 -> 101

1 and 100/101 or 1001/101

If it's already in decimal form (instead of 1 and 4/5, you have 1.8), then there's no easy way to do it that I know of. This is partly because the only decimals in binary that don't continue on forever are those which, in fractions form, have denominators made only of 2's. 1/2, 1/4, 3/4, 1/8 and so on.

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Q: What are the steps in converting decimal number with fractional part to binary number?
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