Understand a fraction a/b with a > 1 as a sum of fractions 1/b.
Add and subtract fractions with like denominators. Start with manipulatives and pictures, then move away from them. Understand that a fraction, such as 4/7 can be made from multiple addends. For example 1/7 + 1/7 + 2/7.
Add and subtract mixed numbers with like denominators. Start with manipulatives and pictures, then gradually move away from them.
Solve word problems involving addition and subtraction with like denominators. No mixed numbers here. That is, all numbers are within 1 (the whole).
Notes: This standard is poorly summarized. The substandards are much more informative.