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Q: How many digits should the sum have after the decimal point?

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In scientific notation, you should have only one digit to the left of the decimal point.

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.

One

There need not be any and there can be any number of them.

one

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.

The answer is limited to the number with the fewest digits of precision (digits after the decimal point). (2 digits of precision)

There should be exactly one non-zero digit.

Depends on what the situation and number is. In generally, there can be as many digits as needed after a decimal point. The amount is infinity.

Only on digit may be to the left of the decimal point. The mantissa must be a number in the interval [0, 10).

There should be 1 non-zero digit.

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