How to simplify $(27,000,000)(0.0004)$ in scientific notation?

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Answer 1 · 2018-05-20T17:29:24

$27,000,000=2.7*10^(7)$
$0.0004=4*10^(-4)$
$2.7*10^(7)*4*10^(-4)=10.8*10^(3)$

$27,000,000=27*10^( color(red)(6))$

6-numbers of zeros, you can write 27 as:
$27=2.7*10$

$27,000,000=27*10^( color(red)(6))=2.7*10*10^( color(red)(6))=$
$=2.7*10^( color(red)(6)+1)=2.7*10^7$

$0.0004=4/10000=4/10^(color(red)(4))=4*10^(-4)$

$2.7*10^(7)*4*10^(-4)=2.7*4*10^(7-4)=10.8*10^3$

How to simplify (27,000,000)(0.0004)(27,000,000)(0.0004) in scientific notation?