In the "old days," when I was an elementary student, I was told that to average, you add up all the numbers and divide by the number of groups to get the average. Not surprisingly,
I HAD NO IDEA WHAT THAT MEANT!
OR WHAT IT HAD TO DO WITH AVERAGING!
I first used unifix cubes to average when I taught "Measurement with Marbles," one of my FAVORITE math units that's now FREE from the Math Learning Center. I hope you enjoy that unit and my little videos on Averaging with Unifix Cubes.
Note: Due to video time limitations I could not show multiple ways to level the towers. When you work with children, however, I encourage you to help kids understand the idea of averaging by giving them 2 stacks, and then 3 stacks of cubes, and asking them to devise methods to level the towers. If we just TELL them what to do rather than allowing them to devise their own strategies, we're really just giving them a different version of my childhood experience (where I had no idea WHY I was doing what I was doing.) Give them some cubes and a little time for productive struggle! :)