Common Core State Standards
CCSS.ELA-Literacy.L.2 Language Standards
Vocabulary Acquisition and Use
CCSS.ELA-Literacy.L.2.4 Determine or clarify the meaning of unknown and multiple-meaning words and phrases based on grade 2 reading and content, choosing flexibly from an array of strategies.
CCSS.ELA-Literacy.L.2.4c Use a known root word as a clue to the meaning of an unknown word with the same root (e.g., addition, additional).