Practice problems are available from a variety of Calculus I content areas – fourteen subcategories (for example Limits, Derivatives, Inverse Funtions), each including multiple topics including evaluating limits, using the chain rule, concavity, optimization, and integration by substitution. The number of practice problems available for each topic is listed next to the topic in the list. Teachers have the ability to create a free account to create new questions. This content could be useful to review calculus topics and could also be incorporated into group activities. The opening Grasple webpage also has links to a Help Center, Blog, Teacher Community and other open learning resources.