Unit 9 Overview:

Students will continue their work with the concepts of addition and subtraction by using a variety of representations such as drawings, sounds, acting out situations, verbal explanations and numerical expressions. It is essential to provide contextual situations for addition and subtraction that relate to the everyday lives of kindergarteners so they can easily understand story problems. It is also important to provide students with experiences with all types of problem structures/situations: 1) add to, result unknown 2) take from, result unknown 3) put together, total unknown and 4) take apart, total unknown. These experiences will lay the foundation for encountering more difficult word problems in subsequent grades.

• Students will represent addition and subtraction with objects, fingers, mental images, drawings, sounds (e.g., claps), acting out situations, verbal explanations, expressions , or equations. (K.OA.A.1)
• Students will use objects, drawings and/or equations to model and solve addition and subtraction word problems within 10 using putting together, adding to, taking apart, and taking from story structures. (K.OA.A.2)
• Students will model decompositions of numbers up to 10 using objects, sets, and drawings. (K.OA.A.3)
• Students will use manipulatives to find the number that makes 10 when added to a given number. (K.OA.A.4)
• Students will apply understanding of compositions/decompositions and the relationship between addition and subtraction when adding and subtracting with 1 and 2 within 5. (K.OA.A.5)