Grade 2
Domain Number and Operations in Base Ten
Cluster Use place value understanding and properties of operations to add and subtract.
Standard Explain why addition and subtraction strategies work, using place value and the properties of operations.<span class='footnote'>Explanations may be supported by drawings or objects.</span>

2.NBT.B.9. Explain why addition and subtraction strategies work, using place value and the properties of operations.Explanations may be supported by drawings or objects.