How do you convert $2.16 x 10^-4$ into standard form?

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Answer 1 · 2015-07-13T23:42:41

$10^-4$ means divided by $10^4=10000$

$=2.16/10000=0.000216$

Or shorter: move the decimal point $4$ to the left.

How do you convert 2.16 x 10^-42.16 x 10^-4 into standard form?