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! NorthStar Digital Literacy Assessments Learn to type faster on a computer keyboard!