Starfall.com is a wonderful website that is designed for younger students to aid with phonics development in learning to read. I love that the stories are animated and illustrated with colorful graphics and there are options to hear the story sections read to you. The words are also highlighted as they are read for help with site word recognition.
For math, students can practice with shapes, patterns and telling time on a clock. The activities are engaging and sounds clips encourage students to continue.
Although there are some limitations in access unless you are registered members, there is plenty available for students to practice and learn with, without signing up. I highly encourage teachers of lower grades, especially English Language Learners or students with IEPs to visit this site and have their students reinforce their learning with the activities provided here.