This package contains 246 cards (123 vocabulary words and 123 definitions) for fourth grade or upper elementary math vocabulary. They are color coded according to the topic they are related to. Blue cards are Numbers in Base Ten. Pink cards are related to Operations and yellow cards are related to Algebraic Thinking. Green cards are customary measurement. Purple cards are metric measurement. Orange cards are fractions and decimals. Red cards are geometry. These can be used in small groups for matching games, or used as a center activity. Also included are answer keys for all 7 sets of cards. There are also two blank cards in each color in case you want to add words of your own.