Embedded Numbers and Decompositions

Description

In Grade 1’s Topic A, we continue the work of developing this ability with all the numbers within 10 in put together situations, with a special focus on the numbers 6, 7, 8, and 9 in 5-group configurations, since recognizing how much a number needs to make 10 is part of the Kindergarten standards (K.OA.4) and easier for most children. Students decompose numbers into 2 visual sets, or conceptually subitize, and record their decompositions as number bonds. In Lesson 1, we use the 5-group configuration, as this organization allows students to quickly “see,” or perceptually subitize, the subset of 5. Once they have identified that first subset of 5, they can perceptually subitize the other part: T: How many dots do you see? S: 8! T: What two parts do you see? S: I see 5 and 3. T: Did you need to count all the dots?