U.S. National Standards
N.1. Number and Operations
1.1. Understand numbers, ways of representing numbers, relationships among numbers, and number systems.
1.1.1. Work flexibly with fractions, decimals, and percents to solve problems.
1.2. Understand meanings of operations and how they relate to one another.
1.2.1. Understand the meaning and effects of arithmetic operations with fractions, decimals, and integers.
1.3. Compute fluently and make reasonable estimates.
1.3.1. Select appropriate methods and tools for computing with fractions and decimals from among mental computation, estimation, calculators or computers, and paper and pencil, depending on the situation, and apply the selected methods.
1.3.2. Develop and analyze algorithms for computing with fractions, decimals, and integers and develop fluency in their use.