Two-Step Word Problems: Estimation and Equations Google Interactive Math Notebook for 3rd Grade Google Classroom, Paperless: This 3rd grade Google Classroom interactive notebook provides guided instruction, example problems, and quick references aligned with common core standard 3.OA.8: Word Problems, Equations, and Estimation. Now you can get all the interaction and engagement of interactive notebooks without all the mess of cutting and pasting and the hassle of lost papers. 3.OA.8. Solve two-