Area of a Rectangle
length factor
- w
- i
- d
- t
- h
- f
- a
- c
- t
- o
- r
Select a factor from the width side. Press "x".
Select another factor from the length side.
Press "=" .
If a rectangle (or squre) does not form, repeat the directions above.
http://www.dsu.nodak.edu/~edkluk/FractAdd/fr_dwnld.html