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This Concept Map, created with IHMC CmapTools, has information related to: AddSubto20take2, equations and symbols requires understanding, equations and symbols to solve unknowns, objects or drawings leading to equations and symbols, understanding of symbols, strategies such as counting on, solving word problems using objects or drawings, counting on to find sums, sums using manipulatives and number lines, Add and Subtract within 20 requires understanding, strategies such as counting back, strategies such as commutative, strategies such as making a 10, relating counting to addition and subtraction by counting back, Add and Subtract within 20 includes solving word problems, answers to subtraction problems using manipulatives and number lines, symbols such as _, strategies such as using doubles, counting back to find answers to subtraction problems, symbols such as +, relating counting to addition and subtraction using strategies