Nothing special happens.
The answer can be smaller or bigger.
A rational can become irrational or the other way around.
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It increases the value.
A decimal number is multiplied by a non-decimal number the same way any two numbers are multiplied together. The place value of the numbers being multiplied must be kept in mind though. So if 2x3=6, just as 2x30=60, 2x0.3 would be 0.6. For numbers with more than one digit, you would treat the multiplication the same way as for non decimal numbers.
Zero has a value of zero no matter where it's placed. In this example, it happens to be in the hundredths place.
A decimal is a way of representing a number. There is no number after a number.A decimal is NOT a decimal point.
A single digit in a number can have a decimal place value: a whole number cannot.