2.NR.2.1
Fluently add and subtract within 20 using a variety of mental, part-whole strategies.
Khan Academy ResourcesAdd within 20Subtract within 20Subtract within 20 visuallyAdd & subtract within 20Subtract within 1,000 using place value blocksSubtract on a number lineAdd within 20 visuallyAdd and subtract within 20 word problemsSubtract within 20 using ten framesSubtract within 20 using a number lineAdding 7 + 6Addition and subtraction word problems: superheroesSubtract within 20 using place value blocksAdding 8 + 7Subtracting 14 - 6Adding within 20 using place value blocksAddition and subtraction word problems: gorillasSubtracting with place value blocks (regrouping)Adding within 20 using ten frames

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