UPDATED 8/18/19I corrected mistakes on the "Associative Property" card.UPDATED 9/29/1816 cards defining and illustrating common-core math vocabulary words. Includes: add, addend, addition sentence, associative property, commutative property, difference, doubles fact, doubles plus 1, doubles plus 2, equal sign, fact family, minus sign, plus sign, subtract, subtraction sentence, sumThe cards are available in one PDF document for easy printing and as separate PNG files.