a is a number with one or more digits to the right of a decimal point.
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A number with one digit after (to the right of) the decimal point is said to have one decimal place. The number can also be said to be rounded to the nearest tenth.
It you are multiplying by a number greater than one (or, equivalently, dividing by a number less than one) then the decimal would either stay put or move to the right.
Move the decimal point to the right one time.
No, it cannot.
One. However, if the number already has a decimal point, you need to move the decimal point one place to the right, adding one zero if needed.