This work builds on work from kindergarten when students composed and decomposed numbers in more than one way and represented these decompositions with their fingers, connecting cubes, two-color counters, drawings, and expressions. Students revisit Put Together/Take Apart, Both Addends Unknown problems through a game in which they decompose a total into two addends. Students record the decomposition with an equation. In Activity 2, students solve and represent story problems based on the context of the game, and explore the different places the total can be represented in an equation, which deepens understanding of the meaning of the equal sign.
- Solve Put Together/Take Apart, Both Addends Unknown story problems in a way that makes sense to them.
- Write an equation and explain why it matches a story problem.
- Pensemos sobre separar números y juntarlos de nuevo.
- Each group of 2 needs 10 two-color counters and a cup (at least 8 oz).
Teacher Reflection Questions
What evidence have students given that they understand the meaning of the equal sign? Why is it important for students to understand the meaning of the equal sign before solving Addend Unknown problems in the upcoming lessons?
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