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Only one non-zero digit.

Q: When writing a number in scientific notation how many digits should be Ito the left of the decimal point?

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One digit

There should be exactly one digit.

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

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

Just remember that there is one digit to the left of the decimal in scientific notation. All the other digits go on the right of the decimal. Then find an appropriate power of ten to write the rest of the number. Your 3,400 in scientific notation is 3.4 x 104in scientific notation.

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One digit

There should be exactly one digit.

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

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

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

Just remember that there is one digit to the left of the decimal in scientific notation. All the other digits go on the right of the decimal. Then find an appropriate power of ten to write the rest of the number. Your 3,400 in scientific notation is 3.4 x 104in scientific notation.

Writing a string of random digits is a proper waste!

Scientific notation involves representing each digit in the number as a power of ten. In a decimal number, you just write the digits in order with a decimal point in the appropriate place.

Scientific notation is a way to signify really long numbers without writing it out in full, all 50 digits. 1,000,000,000 in scientific notation is 1.00 X 109

Your 150 will be 1.50 x 102 in scientific notation. In scientific notation, we will see only one digit to the left of the decimal, and the other digits will appear on the right. And we'll see the "location" or "position" of the decimal set by a power or ten.

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

Because it uses fewer digits as for example 9,000,000,000,000,000 in scientific notation is 9.0*10^15