Question 111259
To start making this (factor tree) you want to pick and two numbers that multiply to make 110.  The two numbers I picked are 55 and 2.  Since 2 is a prime number I do not have to break it down any further (a good idea is to circle it so you dont forget it.)  Then I broke down 55 into 11 and 5.  11 and 5 are both prime numbers so they do not need to be broken down any further.(circle them).  Now when there are no more numbers to break down.  Express the answer as a product of prime numbers.
 
                 100
               55    2
             11  5
answer: 11*5*2