This Let's Count to 20 Lesson 6 - Building Sets of 19 and 20 lesson plan also includes:
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Bean counters connect cubes to compose and decompose the number 20. They use sticks with beans glued onto them to model and make bundles of 100. Terrific teacher tips, printable handouts, and plenty of other resources make this lesson a nice stand-alone, or a creative component to the mini unit.