This lesson is optional because it does not address any new mathematical content standards. This lesson does provide students with an opportunity to apply precursor skills of mathematical modeling. In this lesson, students use objects in their classroom to create story problems and equations. When students ask mathematical questions that arise from a situation and use mathematical features of a situation to solve a problem, they model with mathematics (MP4).
- Add within 20 with three addends.
- Write and solve story problems.
- Escribamos problemas-historia de suma y de resta.