(4 x 10^4) + (2 x 10^2) + (4 x 10) =
Answers:	A) 302400	B) 32400	C) 40240	D) 3240	E) 324
When you multiply a number by 10 you just add a zero   =&gt; 4 x 10^4 =&gt; add 4 zeros =&gt; 4 x 10^4 = 40000   =&gt;2 x 10^2 = 200   =&gt; 4 x 10 = 40   =&gt;4 x 10^4 + 2 x 10^2 + 4 x 10 = 40000 + 200 + 40= 
<gadget id="calculator">40000 + 200 + 40</gadget>
<output>40_240</output>
40240=&gt; answer is 40240 ( 40240)
<result>C</result>
(4 x 10^4) + (2 x 10^2) + (4 x 10) =