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,

Number and Operations-Fractions

- Build Fractions from Unit Fractions by Applying and Extending Previous Understandings of Operations on Whole Numbers
understand a fraction 𝘢/𝘣 with 𝘢 > 1 as a sum of fractions 1/𝘣