addition videos

Gonna try this again!

3-digit addition using base 10:

http://www.youtube.com/watch?v=glqrsJ9AUk0

3-digit addition using number line:

http://www.youtube.com/watch?v=E8qbSRJc4hs

3-digit addition using partial sums:

http://www.youtube.com/watch?v=nN6udy82OT8&feature=youtu.be

3-digit addition using expanded form:

http://www.youtube.com/watch?v=gA0SKYtn4b0&feature=youtu.be