A common denominator is needed when adding fractions with differing denominators. The pre-algebra concept of combining like terms is briefly noted.
These resources are part of KET's Math Instructional Strategies: Number Operations collection.
Students may sometimes be unsure when adding or subtracting fractions with differing denominators. In this situation, the idiomatic expression, "You can't add apples to oranges" may come to mind. Finding a common denominator is the solution when adding or subtracting fractions with differing denominators. The concept of like terms can be glimpsed as a result of finding the common denominator.
Academic standards correlations on Teachers' Domain use the Achievement Standards Network (ASN) database of state and national standards, provided to NSDL projects courtesy of JES & Co.
We assign reference terms to each statement within a standards document and to each media resource, and correlations are based upon matches of these terms for a given grade band. If a particular standards document of interest to you is not displayed yet, it most likely has not yet been processed by ASN or by Teachers' Domain. We will be adding social studies and arts correlations over the coming year, and also will be increasing the specificity of alignment.