If you add 6 rows to the bottom of the picture below, how many small
triangles
will you have altogether?
Well, you could draw the picture and try and count all the
triangles,
but it might be better to look for a pattern. Remember, we're only
counting the little triangles (but we are counting the ones that
point down as well as the ones that point up).
As always, be sure to explain the
work you did to arrive
at your answers!