3.72 * 10-11
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The point of using scientific notation is to compute very large or very small numbers.
7.27 already has only one number to the left of the decimal point; the number is already in scientific notation.
Since .4428 is to the ten thousandths place, and scientific notation only takes an integer, a decimal point and then the numbers after it, the scientific notation would be 4.428 * 10-1
To write 99.7 in scientific notation, you can move the decimal point to the right until there is only one non-zero digit to the left of the decimal point. Count the number of places you moved the decimal point. Since you moved it two places, the scientific notation representation of 99.7 would be 9.97 × 10^1.
25 in scientific notation is 2.5 × 10^1 since you shift a decimal place to the left from the starting point of 25.0.