March 31, 2008
The class built scales from http://netapps.marshall.edu/lego/lessonplans/BalanceScale/BalanceScale.html
The middle of 40 is 20. There is a length of 20 studs on each side of the fulcrum.
6 x 3 = 1 x 18 3 x 6 = 1 x 18
Write down as many equations of products of two factors as you can make.
2 x 19 + 1 x 1 = 3 x 13
