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Only if you don't try:-)  Any subject is difficult to understand if you don't take time to study it.  Practice solving problems.  

Start with similar problems.  For example, master the application of fractions in real life by solving problems involving operations on fractions.  Start with the easy ones.  Plan solving at least 3 similar problems a day.  Then challenge yourself :-)

If you don't a understand a term used by your teacher, research about it and how it's used in expressions.  There's a glossary of Math terms in your textbook.