Here are some websites that you can visit that offer coding activities. Many sites have activities sorted by, or searchable by, age or grade level.
https://code.org/learn (K-12. Students can sign in to save progress. Teacher can assign challenges and see progress.)
Tynker (K-6+)
https://codecombat.com/play (teachers can set up a class easily if you want your students to save their progress by logging in. Or you can play without saving. Students learn to code with Python or JavaScript. No experience necessary.)
Scratch (4th grade and up)
CS First (Free curriculum by Google. Uses Scratch. Create a class and add lessons for your students to do independently.)
Khan Academy (4th grade and up)
Brain Pop: CodeCombat: Ogre Encounter
BrainPop: Ogre Encounter
Star Wars (1-5)
Computer Science with Google: sign up for a club from a variety of choices, such as storytelling and word animation, and Google will send you the materials you need.