Which one is bigger: $\;35{,}043 × 25{,}430\,$ or $\,35{,}430 × 25{,}043\;$? 
Which of the two quantities is greater?
Quantity A: $\;\;35{,}043 × 25{,}430$
Quantity B: $\;\;35{,}430 × 25{,}043$

What is the best and quickest way to  get the answer without using calculation, I mean using bird's eye view?

Hint: Compare $a\times b$ with
$$(a+x)\times (b-x)=ab-ax+bx-x^2=ab-x(a-b)-x^2$$
keeping in mind that in your question, $a> b$ and $x>0$.
