Code.org

https://code.org/

Pre-built Elementary Curriculum: https://code.org/educate/curriculum/elementary-school

Pre-built Middle School Curriculum: https://code.org/educate/curriculum/middle-school

Hour of Code Games: https://code.org/hourofcode/overview

Personal favorite: Graph Paper Coding: https://code.org/curriculum/course2/1/Teacher

This will vary with depending on the grade level, however each course includes an easy to follow teachers guide.

When students complete a course, they can earn a Badge for that course.