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Elementary school mathematics teachers, parents, youth librarians, and after-school teachers, may be interested in this collection of 25 online educational math games. Arranged by grade level and topic, these games provide an engaging way for youth to practice and review a number of math skills and concepts. These skills include recognizing numbers, calculating equivalent fractions, and understanding the four basic operations. Each of these games is designed for young learners to play on their own, making this website a possible option for students who finish assignments before their classmates. This website is created and maintained by Funbrain, a children's educational website that is part of the Family Education Network. [

For high school mathematics teachers, the National Council of Teachers of Mathematics offers this collection of activities to help young mathematicians develop their quantitative reasoning skills. These activities have been developed by high school and college mathematics educators and can be downloaded in PDF format from this online library. Each PDF features a detailed teacher's guide as well as a student hand out. In one activity, "Cash or Gas?" students consider whether it is better to receive $250,000 in cash in an imagined lottery or free gas for life. Another activity, "As the Crow Flies," is designed to help students understand the logic and reasoning behind the Pythagorean theorem. These activities can be implemented alongside existing mathematics curriculum as they align with Common Core Standards.

For math students and teachers, this series of short videos (10-15 minutes apiece) by mathematician Kelsey Houston-Edwards provides engaging explanations of upper-level mathematics concepts. One example: Houston-Edwards explains graph coloring and how the math concept relates to the popular puzzle, Sudoku. In another video, viewers learn about Pick's theorem and how it can be used to calculate the area of complex polygons. These videos are likely to appeal to viewers with a range of mathematical backgrounds: Houston-Edwards dedicates each video to complex, advanced mathematical concepts, but is also quite skilled at breaking down these concepts with accessible diagrams and simple vocabulary.

Each day of the school year I present my students with an estimation challenge. I love helping students improve both their number sense and problem solving skills. I'd like to share the estimation challenges with you and your students. Michael Fenton and I have collaborated on this handout for your students. Happy Estimating!