5.NF.1:
Number And Operations - Fractions
Use Equivalent Fractions As A Strategy To Add And Subtract Fractions.
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.)
5.MD.5b:
Measurement And Data
Geometric Measurement: Understand Concepts Of Volume And Relate Volume To Multiplication And To Addition.
Apply the formulas V=l x w x h and V=b x h for rectangular prisms to find volumes of right rectangular prisms with whole-number edge lengths in the context of solving real world and mathematical problems.