Here are a few resources I've found that would be great for your child to use at home to build skills in the four pillars of Science, Technology, Engineering and Math. There are a few for you as a parent here to. Ill be adding more and maybe some fun at home projects as we go throughout he school year.
As always be sure to monitor your child's online activities as your home settings may not be as secure as the schools.
Always remember, You Are Your Child's Best Teacher!
Grade specific math activities that follow along with the common core curriculum:
https://www.splashlearn.com/math
National Geographic Kids
https://kids.nationalgeographic.com/
Kahn Academy
*More to come as I create a useful list.