86.404 = (8 x 10) + (6 x 1) + (4/10) + (0/100) + (4/1000).
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1x1000+7x100+6x10+0x1
8.3 = (8 x 1) + (3/10)
2.05 = (2 x 1) + (0/10) + (5/100)
0.03056 in Scientific Notation = 3.056 x 10-2
No reason to put it in scientific notation but the result would be 2.59 x 10^4