# Standards for the lesson planNumber and Operations: 24®

These standards and benchmarks are from McREL's online database, Content Knowledge: A Compendium of Standards and Benchmarks for K-12 education (4th edition, 2004) (http://www.mcrel.org/standards-benchmarks/.) The mathematics portion of the database was developed using National Council of Teachers of Mathematics (NCTM) standards in addition to other nationally recognized standards documents.

Standard 1: Uses a variety of strategies in the problem-solving process

Benchmark 4: Uses trial and error and the process of elimination to solve problems

Benchmark 7: Uses explanations of the methods and reasoning behind the problem solution to determine reasonableness of and to verify results with respect to the original problem

Standard 3: Uses basic and advanced procedures while performing the processes of computation

Benchmark 1: Multiplies and divides whole numbers

Benchmark 5: Performs basic mental computations (for example, addition and subtraction of whole numbers)

Benchmark 7: Understands the properties of and the relationships among addition, subtraction, multiplication, and division (for example, reversing the order of two addends does not change the sum; division is the inverse of multiplication)