Exponential or "Scientific" notation is a way of writing numbers that are too big or too small to be conveniently written in decimal form. To overcome this one expresses the number and the power of 10 to which that number has to be raised.
Here are some examples:
Number -------------Exponential form
2 -------------------2×100
0.2 -----------------2×10−1
400 ----------------4×102
6,730,000,000 ------6.73×109
0.00000000773 -----7.73×10−9
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The exponential notation for 4 is 4.0 × 100
The exponential notation of 72 is: 7.2 × 101 or 7.2E1
The exponential notation of 0.00001 is 1.0 × 10-5
1 in exponential notation would be 1.0 × 100
0.002983 in exponential notation is: 2.983e-3