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This Concept Map, created with IHMC CmapTools, has information related to: Add Sub July 16, understanding of symbols, symbols such as +, strategies such as counting back, manipulatives and numberlines showing understanding, word problems correct symbols, word problems using mental math, strategies such as commutative, mental math demonstrated by strategies, strategies such as making a 10 using whole numbers, word problems using manipulatives and numberlines, relating counting to addition and subtraction by counting back, Add and Subtract Withing 20 using Whole Numbers by relating counting to addition and subtraction, strategies such as doubles, symbols such as -, relating counting to addition and subtraction by counting on, word problems using illustrations, word problems using strategies, sums using manipulatives and numberlines, symbols such as =, strategies such as using 0