Students will learn how to add and subtract mixed numbers, where regrouping is necessary. Subtracting mixed numbers with like denominators is a bit easier than subtracting with unlike denominators. Here's an example of the former, and here's one of the latter.
Conclude by leading this investigation:
Raindrops Down Windshield (number order, algorithm)
5.NF.A.1: Add and subtract fractions with unlike denominators (including mixed numbers) by replacing given fractions with equivalent fractions in such a way as to produce an equivalent sum or difference of fractions with like denominators. For example, 2/3 + 5/4 = 8/12 + 15/12 = 23/12. (In general, a/b + c/d = (ad + bc)/bd.)