Common Core Alignment: Subtracting Mixed Numbers: Same Denominators

4.NF.3c:

Number And Operations - Fractions

Build Fractions From Unit Fractions By Applying And Extending Previous Understandings Of Operations On Whole Numbers.

Add and subtract mixed numbers with like denominators, e.g., by replacing each mixed number with an equivalent fraction, and/or by using properties of operations and the relationship between addition and subtraction.