Formative Assessment for Combinations of 10
The school year is in full swing in my neck of the woods and we have been hard at work doing assessments, setting up groups and even getting some teaching in! My second graders have been looking at addition and subtraction strategies for facts to 20. One of my top priorities for this unit is making sure kids are solid with combinations of 10 by the middle of the unit. Without being solid with combinations of 10, some of the most efficient strategies for the facts between 10 and 20 are much more challenging for kids to develop. We talk about the friends of 10 from the first day of the unit and incorporate games like make 10 go fish , flip and write , pyramid , and popper cups . My second graders are getting really good at these! This morning, I was thinking they all seemed fluent but I wanted a quick way to check without another formal assessment. Today I was using One Big Pair of Underwear to introduce the difference model for subtraction...