https://momath.org/ Take a virtual tour of the exhibits at MoMath, the National Museum of Mathematics in NYC.
Family Math - National Council of Teachers of Mathematics - Ideas for using math in everyday life
https://www.pbs.org/parents/thrive/8-indoor-activities-to-release-kids-energy - Mix math into movement
First Fun Math - ideas for primary math
Math and Music - Jack Hartmann Kids Music Channel - a variety of You Tube math videos
https://www.gregtangmath.com/challenges Greg Tang Math challenges and puzzles