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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Varanasi, also known as Benaras, was called "the Ancient City" when Lord Buddha visited it in 500 B.C., and is the oldest, continuously inhabited city in the world today.