(3 x 10^5) + (2 x 10^3) + (4 x 10^2) =	Options:
A) 302400  B) 32400  C) 30240  D) 3240  E) 324
When you multiply a number by 10 you just add a zero   =&gt; 3 x 10^5 =&gt; add 5 zeros =&gt; 3 x 10^5 = 300000   =&gt;2 x 10^3 = 2000   =&gt; 4 x 10^2 = 400   =&gt;3 x 10^5 + 2 x 10^3 + 4 x 10^2 = 300000 + 2000 + 400= 
<gadget id="calculator">300000 + 2000 + 400</gadget>
<output>302_400</output>
302400=&gt; answer is 302400 ( 302400)
<result>A</result>
(3 x 10^5) + (2 x 10^3) + (4 x 10^2) =