When you divide two values given in scientific notation, divide the mantissa numbers and subtract the exponents in the power of ten. Then adjust the mantissa and exponent so that the mantissa is between 1 and 10 with the appropriate exponent in the power of ten. Notice what happened to the decimal point and exponent in the examples. You subtract one from the exponent for every space you move the decimal to the right. You add one to the exponent for every space you move the decimal to the left.
Most scientific calculators work with scientific notation.
That is for entering scientific notation. 3 EE or EXP 2. The metric system is a much more logical and straightforward system than the old english system still used in the United States. Every other nation in the world uses the metric system, so in today's global economy, it is very advantageous to learn how to use the system. It is also the system used in science.