Answers

2015-06-04T13:08:09+05:30
Use the tricks of vedic maths or join the UCMAS classes. It will increase your speed and also for mental calculation
0
thanks'
so please mark the answer as brainlist
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2015-06-04T13:11:18+05:30
Simply and easy method is vedic maths . vedic maths is solve very very large number . try  this  
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i don't know vedic maths
search in google
or in youtube