Mental Math
Mental math is a crucial exercise for your brain. Usually I don't use Calculator for simple algebraic calculation. I have seen many guys pressing buttons to multiply 25*25 or 22*20; summation of large samples on calculator. Try to do these on your brain. Think about when Einstein had solved his problems without calculator. Calculator helps us a lot to solve quadratic equations, complex equations but make our brain dull too. For this consequence, we know very well how to deal with it. Wanna solve maths quickly? Do some inside your head! It's called Mental Math ;)
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