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Unit: K.2

Introducing Addition and Subtraction

In this unit students

•  understand addition as putting together or adding to, and subtraction as taking apart or taking from;
•  represent addition and subtraction with objects;
•  compose and decompose 5 or less;
•  begin working towards fluency within 5.

Counting objects prepares students for addition and subtraction. In this unit they gain an initial understanding of these operations using the ideas of putting together and taking apart, or adding to and taking from. They work with objects to represent these operations. They represent a number as a sum in multiple ways, which is import ant for future fluency and flexibility with numbers.

Students express numbers up to 5 as sums in different ways, e.g., 5 = 2 + 3 and 1 + 4 = 5. They demonstrate their understanding using drawings and objects. They also continue practice with counting and writing numbers.

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