By sheer coincidence, my very first tutoring family were homeschoolers back in 2000 (www.homeschoolnyc.com).    Whatever this Fall may bring, students may be learning from home at least part of the time.  I will be sharing online resources  biweekly.
Please comment/share ideas on what has been helpful

Estimation 180 has photos for estimation: “tasks that make mathematical reasoning accessible to students and enjoyable.”

Visual Patterns asks visitors to “Click on a pattern to see a larger image and the answer to step 43. What is the equation?”

New York Times What’s Going on in This Graph? is a colorful ‘real-world’ Math resource sure to spark discussion (and even debate!)

Khan Academy and their Get Ready for Grade Level for all grade levels

Delta Math also has online practice although mostly for middle and high schoolers