Because
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a proper fraction, a decimal or a negative number.
Not necessarily: for example, consider 0.5 * 4 = 2
That is not necessarily the case.2.5*4.3 = 10.75 which is larger than either of the numbers being multiplied.
You do not need to align decimal points when multipylng. You multiply the two numbers ignoring the decimal point but ensuring that any trailins 0s are present. The number of digits after the decimal point in the answer is the sum of the number of digits after the decimal points in the two multiplicands.
To determine which decimal number is smaller between 0.098 and 0.45, we compare the digits place by place starting from the left. In this case, 0.098 is smaller than 0.45 because the first digit after the decimal point is smaller in 0.098 (0.0) compared to 0.45 (0.4). This means that 0.098 is the smaller decimal number in this comparison.