General Instruction:
Chromebook App Hub (Get new ideas for teaching and learning with everything accessible on Chromebooks)
Achieve the Core (Resources for Common Core Standards in all subject areas)
Open Ed (resources for most subjects aligned to standards, as well as assessments)
Wonderopolis (Informational text for all sorts of questions that we wonder about)
Pixton (make online cartoons with content of your choice)
Quizzizz (Similar to Kahoot! ... with some more options)
Math:
Illustrative Mathematics (performance tasks & open-ended problems aligned to particular grade level standards)
Guided Math Blog with Resources - Gr. 5
Guided Math: A Framework for Mathematics Instruction by Laney Sammons
Multiplication Fact Family Practice
Multiplication/Times Table Practice
Science:
Building Blocks of Science (Carolina Site)
Tech/Coding:
Tynker's Hour of Code (several options at all skill levels)
Kodable (Learn the basics of coding with fun mazes and puzzles)