Topic C introduces formal addition concepts including writing and solving expressions and equations. The first three lessons ask students to represent addition story problems involving decomposition and composition, modeled by A + B = C and C = A + B. In these first formal addition lessons the stories are told with no unknown. “There are 7 apples in the bowl. 5 of them are red and 2 of them are green.” Students write addition sentences and identify the referent of each number within the problem. Lessons 13–15 work with 6, 7, and 8 respectively, representing such addition stories with pictures, numbers, and equations. In Lesson 16, students solve add to with result unknown (A + B = ___) word problems within 8. “There were 5 birds in the tree. 3 more birds flew to the tree. How many birds are in the tree now?” Students learn to put a box around the equation’s unknown. Lesson 17 teaches put together total unknown (also A + B = ___) word problems. On the surface these problems appear similar those of Lesson 16, but lack the embedded action of the previous problems. Instead, they focus on a set of objects and part–whole relationships. “There are 4 red toy cars and 3 blue toy cars on the table. How many toy cars are on the table?” Lesson 18 deals with the last type of addition situation in kindergarten, both addends unknown (C = ___+___). Note that this take apart situation is modeled with an addition equation. Students are given a total and are asked to find a number pair in the context of an addition story. “There were 8 toy cars. Some are on a shelf and the rest are in a toy box. Write an addition sentence to show how many could be in each place.” For examples of all problem types, refer to the Operations and Algebraic Thinking progression document, page 9.
Kindergarten Mathematics Module 4, Topic C
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