Before the lesson, I prepped the chart. The first class is the younger of the two, so I wrote the facts up. The second, older class has one without the facts.
Six students were chosen to place a post-it in each square, each student completing a row. To get more involved, two additional students were chosen to "break" the row of 5. The squares are pre-drawn so they can "see" what is missing. Similar to putting an "X" on the ones we are breaking off in the original lesson I read. One student broke off a piece of the row, and another fills in "how many are left." (The older class wrote the whole fact.)
Just as an introduction, I showed them how we can reverse the addition and subtraction sentences to make them "family." Using the language that will be oh so important in Kindergarten!!
Their hands-on activity was using cube trains to break apart the numbers. The older class wrote on individual white boards while the younger class just used the manipulatives. I was able to get a picture of the chart, then the battery on my camera died. But you get the idea!
