How to solve this without using calculator?
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Answer: You can use the laws/formulaes of exponents to solve such questions very easily.
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Since ur asking without calc
a=(2.0×10^6)^2= 4×10^12
b=(1.0×10^7)^2= 1×10^14
a-b= 3 * 10^-2
So 3*10^-2/2*0.02*10^-2
both 10^-2 on numerator and denominator get cancelled
3/2*0.02 = 0.03
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