Unit 3
Sumemos y restemos hasta 20
Unit Goals
Unit Narrative
In this unit, students develop an understanding of 10 ones as a unit called “a ten” and use the structure of to add and subtract within 20.
In kindergarten, students composed and decomposed the numbers 11–19 into 10 ones and some more ones. In a previous unit, students solved story problems of all types with unknown values in all positions and numbers within 10. They used the relationship between addition and subtraction, drawings and equations, and various tools (10-frames, connecting cubes, two-color counters) to represent the quantities in the problems....
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