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Because the number of digits after the decimal place in a product does not require that.

Q: Why is it not necessary to line up the decimal point when multiplying two numbers?

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If two decimal numbers have x and y digits after the decimal point respectively, then their product has (x + y) digits after the decimal point.

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.

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Generally, whole numbers that have no digits after the decimal point are not written as decimalsm but if it is, 30000 would be written as 30000. or 30000.0 or with as many zeros as you like after the decimal point, though the decimal point and zeros are not necessary.

There can be no number that has more than one decimal point.

Related questions

why does multiplying numbers by ten move the decimal point to the right

It is not. When multiplying two whole numbers you need not be concerned about placing the decimal point in the answer.

When multiplying a whole number by a decimal with two places, ignore the decimal point and multiply as if you were multiplying two whole numbers. After you get the answer, re-insert the decimal point so that the product has two decimal places.

You don't move the decimal point at all. You just multiply the numbers and the point should sort itself out or be put of how many digits it is to be.

You do the multiplication in exactly the same way. The only extra thing is that when multiplying decimals, you need to place the decimal point (or decimal comma - depending on your country) in the correct position. If one number has, for example, 3 digits after the decimal point, and the other 4, you need to place the decimal point in the result (BEFORE eliminating unnecessary zeros) in such a way that there are, in this example, 7 digits (3 + 4) to the right of the decimal point.

When multiplying a whole number by a decimal with two places, ignore the decimal point and multiply as if you were multiplying two whole numbers. After you get the answer, re-insert the decimal point so that the product has two decimal places.

If two decimal numbers have x and y digits after the decimal point respectively, then their product has (x + y) digits after the decimal point.

move the decimal down and over however many numbers are behind the decimal

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To multiply decimal numbers, the decimal point is ignored and the multiplication is done as though they were (large) integers. The last step is to put the decimal point into the answer by ensuring the same number of digits follow it as were following the decimal points in the numbers multiplied together; trailing zeros can be removed at this point.

Example of multiplying whole decimal numbers: 2.37 × 3.56 = 8.4372 Remove the decimal point and multiply as for whole numbers: 237 × 356 = 84372 Then add the decimal point, thus : 8.4372

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.