NY-2.OA.2a
Fluently add and subtract within 20 using mental strategies. Strategies could include: counting on; making ten; decomposing a number leading to a ten; using the relationship between addition and subtraction; and creating equivalent but easier or known sums.
Khan Academy ResourcesSubtract within 20Add 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 - 6Addition and subtraction word problems: gorillas

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