3rd-12th Grade Math & Science Resources Resources to focus on a specific academic subjects for grades 3-12 Khan Academy–3-6th grad math and science; Algebra, geometry, biology, chemistry and more! Watch these video for instructions about getting started: getting started for kids 12 and under; getting started for kids 13 and up. Interactive Science and Math Resources for ages 8 and Up Phet Interactive Simulations–Fun science and math demonstrations; Physics, Chemistry, Math and more! Fun Science Demos–Do fun science experiments with materials from your own home! Code.Org Hour of Code–Fun introductory coding and computer science activities!