4,986.219 = (4 x 1000) + (9 x 100) + (8 x 10) + (6 x 1) + (2/10) + (1/100) + (9/1000)
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465.3 = (4 x 100) + (6 x 10) + (5 x 1) . (3/10)
3.8 * 10^14
I assume you mean scientific notation. This is 1.5x108.
6.64 x 10-7
You write in the numbers in words when you write in expanded.