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Works the same way as yesterday's Regifting Robin Two digit number is 10x+y so we have 10x+y-x-y = 9x, ie all results will be multiples of 9, the lowest 9 and the highest 81.

The Middle School Portal 2: Math and Science Pathways project (MSP2) is a component of the National Science Digital Library (NSDL) that supports middle school educators and youth by offering contextualized, high-quality resources and promotes interactivity, collaboration, and knowledge-sharing among its users. Educators can access MSP2 to increase content knowledge in the areas of science, mathematics, and technology, and to build knowledge on developmentally appropriate pedagogy for youth aged 10 to 15. MSP2 also connects middle school youth to fun and engaging information on math, science, and technology, as well as health, safety, and career exploration. Web tools such as blogs, wikis, podcasts, RSS feeds, and social networking services are being used in the continued development of MSP2 to transform passive, text-based information into a dynamic, collaborative experience that promotes the creation, modification, and sharing of resources, and facilitates professional development. MSP2 is a project of The Ohio State University, National Middle School Association, and Education Development Center, Inc., and is funded by the National Science Foundation.

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The NSDL was created by the National Science Foundation in 2000 to provide organized access to high quality online resources and tools that support innovations in teaching and learning at all levels of science, technology, engineering, and mathematics education.

Free digital textbook on probability theory and statistics