Developing an understanding of fraction equivalence, addition and subtraction of fractions with like denominators, and multiplication of fractions by whole numbers (mathlearningcenter.org)
Solve word problems involving addition and subtraction of fractions referring to the same whole including cases of unlike denominators e.g. by using visual fraction models or equations to represent the problem. (nationalmathfoundation.org)
a. Understand addition and subtraction of fractions as joining and separating parts referring to the same whole. (k-5mathteachingresources.com)