The work in this lesson builds from grade 1, where students add and subtract within 20 with different strategies. This is a chance to formatively assess how students find sums and differences in this range. Connecting cubes organized in towers of 10 and singles should be made available for students to use, however encourage students not to use them if they don’t need them. By the end of grade 2, students must fluently add and subtract within 20.
Tell students that, at the end of the lesson, they will be asked to identify specific examples of norms they experienced as they did math.
- Action and Expression
- Add and subtract within 20 in a way that makes sense to them.
- Sumemos y restemos hasta 20.
Teacher Reflection Questions
- Number Puzzles: Addition and Subtraction (1–4), Stage 1: Within 10 (Supporting)
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