As many as there were before the number was read!
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Billions are integers and so there will be no decimal points or digits after it.
The answer depends on how many decimal places are in the summands.
You need to add up the number of digits to the right of the decimal to find the number of digits in the answer. If the first factor has 2 digits to the right of the decimal point and the second factor has 3, the final answer will have 5 digits to the right of the decimal point.
It takes 7 digits.
At least 1