Looking for an engaging way to keep your students focusing on the skill of adding and subtracting within 20 as you celebrate Earth Day? 20 Worksheets to Practice Adding and Subtracting through Fast Facts, Missing Addends, determining if problems are true or false, determining unknown whole numbers in both addition and subtraction number sentences, and word problems.Looking to practice this skill all year? This is included in the Holiday Addition/Subtraction within 20 Bundle.What's Included?7 Ad