I am new in this website. Please help me with my math homework.

How do you subtract fractions?

How do you subtract 7 and 2/5 AND 4 and 5/10? (7 and 2/5 - 4 and 5/10)

How do you subtract 6/10 and 6/20?

Thank you!

Please visit the following site for a super good tutorial:
http://64.78.42.182/sweethaven/Math/pre-algebra/PreAlg01/default.asp?iNum=0403