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World Book (K-Grade 12) is the leading online encyclopedia.  Click below to learn more about the specific features offered by World Book. Early Learning (K-Grade 3) Early Learning supports early elementary students with “Trek’s Travels,” “Welcome to Readi...

Subscriptions cover a wide range of valuable content in various subject areas and grade levels. All subscriptions are available for Enrolled and Flex families. If you are a Registered family, please select the bar below the video to discover which subscription...

Mathseeds (K-3) provides structured, engaging math lessons that support and motivate struggling learners. Mathseeds starts with a placement test of up to 60 questions. The program then assesses student work and provides review as needed. Mathletics (Gr. K-9) ...

Mystery Science (K-5) is a site with “open-and-go lessons that inspire kids to love science.”  This Subscription is not available to HCOS Registered students. Mystery Science Explained Hands-on — lead students in the doing of science and engineering. ...