Identity Propertie

I learned a easier way to multiply in math today. Identity property is when you multiply any number times 1, the number stays the same. For example A times 1=A OR 5 times 1=5. Compatible #'s things that work 2gether. Another example: if you multiply 15 times 5 then you multiply 5 times 10 and 5 times 5. Then add the products of both problems then you get the answer.