Topic B carries forward the work of Topic A, building students’ skill with number pairs for 6, 7, and 8, which is cultivated and maintained throughout Topics B and C during Fluency Practice. In the first three lessons of this topic, students decompose 6, 7, and 8. These decompositions are modeled as put together situations and represented as addition expressions (C = ___+ ___), as opposed to the take from decomposition type (C – B = ___), which will be taught in Topic D. Lessons 7–9 provide intensive work with decomposing 6, 7, and 8 into number pairs. Students identify all of the pairs using story situations, objects, sets, arrays, and numerals. In Lessons 10 and 11, students use linking cube sticks to again model the decompositions of 6, 7, and 8 in order to explore the patterns that emerge (pictured below). Throughout, they work with different configurations of the number bond model to support flexible thinking moving from part to whole and whole to part, composition to decomposition.
Kindergarten Mathematics Module 4, Topic B
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