There should be no points after the decimal point.
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Unlike addition, there is no need to line up the decimal points. Just multiply ignoring the decimal points. When you are done, move the decimal point of the result to the left equal to the number of digits after the decimal point for both multiplicands.
Any decimal less than one will round to zero.
100 grams is 100 grams. It has nothing to do with decimal points.
Because it is a point that is used in the decimal system of counting. Decimal means based on ten.
Not in the way we that would use a decimal point today. But they did use points to signify fractions of 12.