Common Core State Standards Guides. These five teacher's guides contain ALL the CCSS requirements for teaching fractions and decimals in grades one through six. Each guide has lessons designed to teach specific standards and worksheets to provide follow-up practice and assessment. The introductory pages for each guide lists the CCSS requirements for fractions and decimals and shows the titles of the corresponding lessons and numbers of worksheets. Note: Fractions in Grades 1 and 2 are in the Geometry section under the Common Core requirements.