Description: Explanations and examples of how to implement the Operations & Algebraic Thinking standards in Grade 1. Students can apply their understanding of the relationship between addition and subtraction to solve more complex word problems. Students could then use a Level 2 or 3 method to determine the unknown (for example, they could count on from 6). So far we have looked at the computation methods that students use to add single-digit numbers and the important understandings regarding the properties of addition and the relationship between addition and subtraction.*Teacher Advisor is 100% free.