How to Deal with Many Zeroes in a Numerical Aptitude Test

One of the common ways people make mistakes while doing basic math in numerical reasoning / quantitative aptitude/ problem solving tests is because of the confusion with zeros (0's). The moment someone has to deal with something like this:

34000*60000*1000000

or

50 thousand people earning 1.3 million $ each for 200 days = ?

You find it difficult or you are overwhelmed. You miss zeros, add extra zeros, get all zero'd up - so how do you do it without getting confused like crazy?

Here's a valuable tip - use '10 to the power notation'. If you don't know what it is, then spend a little time learning it - the notation is essentially

100 = 10-squared = 10^2 (10 to the power of 2)
1000 = 10^3
10000 = 10^4
million = 10^6
billion = 10^9

so

50 thousand people earning 1.3 million $ each for 200 days = ?

will be represented as follows:

(5*10^4)*(1.3*10^6)*(2 * 10^2)

= 5*1.3*2* (10^4*10^6*10^2)
= 6.5*2*(10^(4+6+2))
= 6.5*2*(10^12)
=  13*10^12  

So, that is the magic for solving maths problems with too many zeros. You want to know many such tips and tricks while you are doing  a technical course. 

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