6th Grade Math:
https://media.pk12ls.com/curriculum/math/family_engage_cc/g06_welcome_en.html
7th Grade Math:
https://media.pk12ls.com/curriculum/math/family_engage_cc/g07_welcome_en.html
7th Grade Accelerated Math:
https://media.pk12ls.com/curriculum/math/family_engage_cc/gA7_welcome_en.html
8th Grade Math:
https://media.pk12ls.com/curriculum/math/family_engage_cc/g08_welcome_en.html
Algebra 1:
https://media.pk12ls.com/curriculum/math/family_engage_cc/g09_welcome_en.html
All Grades
Brian McLogan on youtube is great.
Khan Academy has really great videos.