Description: A guide to major, supporting, and additional clusters in Grade 1. Emphases are given at the cluster level. Use place value understanding and properties of operations to add and subtract. Note, the critical areas are a survey of what will be taught at each grade level; the major work is the subset of topics that deserve the large majority of instructional time during a given year to best prepare students for college and careers. Students should spend the large majority1 of their time on the major work of the grade.*Teacher Advisor is 100% free.