Doubles' Neighbor: Doubles Plus One

Last week we reviewed Doubles Plus One by creating Double and Doubles Plus One neighborhood houses. We talked about how if you learn a Double, you can learn a Double Plus One because one addend goes up by one therefore the sum goes up by one. The students were able to see that the two addends were numbers that are next to one another on a numberline - they were neighbors. The students then worked in groups to complete fact families for Doubles and their Doubles Plus One neighbor. As we discussed their fact families they noticed that Doubles Plus One have more number sentences than Doubles, that Doubles are always even because since the numbers are equal they each have a partner, and that Doubles Plus One are always odd because there is always one too many. You can read their reflections on Doubles and Doubles Plus One at their student blog.