1.RA.B.6
Demonstrate that subtraction can be solved as an unknown-addend problem.
Khan Academy ResourcesAdd within 20Subtract within 20Subtract within 20 visuallyAdd & subtract within 20Add within 20 visuallyAdd and subtract within 20 word problemsAddition and subtraction word problems: superheroesAdding within 20 using place value blocksAddition and subtraction word problems: gorillasAdding within 20 using ten frames

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