Subtraction is very useful in Quantative Aptitude.
Here are some shortcut methods for subtraction which can be useful.
Subtraction of numbers close to multiple of 10.
Subtraction By Complement Method.
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Interesting Facts
India was one of the richest countries till the time of British rule in the early 17th Century. Christopher Columbus, attracted by India's wealth, had come looking for a sea route to India when he discovered America by mistake.