Question

How d o solve this? I am very confused and I forgot how to do it.

Answer 1

$\bf (4.8\times 10^8)(2\times 10^{-3})\implies (4.8\cdot 2)(10^8\cdot 10^{-3})\implies (9.6)(10^{8-3}) \\\\[-0.35em] \rule{34em}{0.25pt}\\\\ ~\hfill 9.6\times 10^5~\hfill$