Question

I know that this question had already been answered. But still I could not understand.
Calculate this question and write the answer in standard form.The answer should come 5*10.
(4.5*10^12)divided by (9*10^10)
4.5E12/9E10= 1/2 E (12-10)=.5E2=5 E 1 or

5*10^1

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