210,000 = 2.100000e+5
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2.1 × 105
2.1 × 10^5
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