Freebee Friday: Instant Curriculum
Whether you pick and choose from its 22 major topics or use the whole curriculum, CK-12 has enough lessons to keep any class working hard and learning. It’s heavy in lessons for math and the sciences with everything from geometry, calculus and the secrets of mental math to how photosynthesis works, but there are also sections for U.S. history and economics. Many of the lessons have discussion topics and assessments built in. All are available online, but some have .pdfs and ebook files available as well as interactive material and videos.