Common Core Standards
Grade 3
Language L.3.4.B
Determine the meaning of the new word formed when a known affix is added to a known word (e.g., agreeable/disagreeable, comfortable/uncomfortable, care/careless, heat/preheat).
Building on the knowledge that's already in your noggin' demonstrates great learning and language flexibility. This skill takes time, practice, and plenty of examples, but it eventually becomes second nature.