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Q: N how many digits should be to the left of the decimal point?

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

Digits after (to the right of) the decimal point contribute to the accuracy of the number, not its magnitude (or size). So only the digits to the left of the decimal point contribute to the magnitude. Digits after (to the right of) the decimal point contribute to the accuracy of the number, not its magnitude (or size). So only the digits to the left of the decimal point contribute to the magnitude. Digits after (to the right of) the decimal point contribute to the accuracy of the number, not its magnitude (or size). So only the digits to the left of the decimal point contribute to the magnitude. Digits after (to the right of) the decimal point contribute to the accuracy of the number, not its magnitude (or size). So only the digits to the left of the decimal point contribute to the magnitude.

The digits should stay where they are. The decimal point should move 2 places to the left.

One

one

There should be exactly one digit.

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

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.

There should be exactly one non-zero digit.

No. 0.0000123 has three significant digits.

If you want to have it in standard format, only one.

One: no more and no fewer. And it cannot be a zero.

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