Big Idea:No solving required! Children need automaticity with subtraction problems within 20. We start to build fluency by learning the identity property and getting automatic with simple subtracting 0, 1, and 2 problems.
Big Idea:My first graders previously learned the relationship between addition and subtraction through fact families. Now I want them to use this relationship as a tool to solve for unknown differences.
Big Idea:I have been teaching my students many strategies to solve subtraction equations. They have learned the inverse relationship between addition and subtraction. Now I want them to see that relationship between doubles facts.
Big Idea:I CAN is a big statement. Students have been practicing subtraction and we want them to persevere and solve word problems to create their own subtraction number sentences. They will use known addition facts to solve subtraction problems.
Big Idea:First graders need to be able to solve subtraction facts with fluency and use math vocabulary to communicate processes and explain their ideas. This assessment will allow me to see who needs further instruction or is ready for advanced material.