Description: Explanations and examples of how to implement the Operations & Algebraic Thinking standards in Grade 1. In Grade 1, where the emphasis is on addition and subtraction, the standards focus on understanding the properties of those operations, adding and subtracting within 20 using increasingly advanced methods, and solving word problems in a variety of contexts. Moreover, other major work of Grade 1, such as work with place value in the Number & Operations in Base Ten (NBT) domain, may be easier to understand once students have a firm basis in addition and subtraction. Perhaps more important, it articulates all of the strategies that students should use to develop fluency with addition and subtraction.*Teacher Advisor is 100% free.