This website is put out by the publishers of the Investigations math curriculum and provides short videos and slideshows that explain strategies we use for solving all different kinds of math problems. You can sort it by grade level or topic. Think of it like a math textbook! There is lots of helpful information there.
Want to learn more about how children learn about numbers, addition and subtraction, fractions, and other math ideas? These short videos by math educator Graham Fletcher explain the stages that children go through as they learn about different topics.
This rich Caregiver's Guide to Math at Home was created by Lesley University's Center for Mathematics Achievement and the Kentucky Center for Mathematics. It includes resources by grade level, from Preschool to 5th grade. For each grade, there are suggested books, songs, and games.
WGBH has created a Distance Learning Resource that has videos and suggested activities for many different content areas and grade levels.
This site, run by a Stanford professor, includes information for parents about math teaching as well as many engaging tasks and games. The focus in on having a growth mindset about math.
Similar to YouCubed, this website has great math games and tasks to try out. These activities will stretch your math brains!