11-8-2013 When do we use common denominators?

1.  Today you will do Buzz Math: Multiplying Fractions With Models for your Warm Up!  (5 Minutes)

2.  Think about this:  When we add fractions we have to find common denominators.  What does this mean?

              1 + 1 =  1x5 =   5    and   1x2 =  2    so  5 +  2 = 7
              2    5      2x5 =  10            5x2 = 10       10   10   10

It means we are cutting up the pieces so they are the same size = denominators the size of 1/10th.



3.  Then we will do Buzz Math: Multiplying Mixed and Whole Numbers 1.