Math Resources:
Youcubed Stanford University Math Mindset: Mathematical Mindset Teaching Guide, Teaching Video and Additional Resources
Khan Academy: https://www.khanacademy.org/math
NCTM Illuminations: https://illuminations.nctm.org/Default.aspx
PBS Math Supports for Early Grades: https://www.pbs.org/parents/learn-grow/all-ages/math
Math Antics: https://mathantics.com/