The children had fun with their wooden number bars, checking out which combinations would be the same length as a longer bar or finding which color combination would be the same length as another combination. This website has the virtual bars (also know as Cuisinaire rods) for some online fun. Can your child tell you the addition sentence? Maybe they can make their fingers match the colors? Hint: A white block is equal to 1, a red is 2... http://www.mathplayground.com/mathbars.html  The button at the bottom can turn the numbers on for you - try it both ways.