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
0.002983 in exponential notation is: 2.983e-3
100 can be written as 1.00 × 102 in exponential notation.
1 in exponential notation would be 1.0 × 100