Use benchmark fractions and number sense of fractions to estimate mentally and assess the reasonableness of answers.

Number Sense, Properties, and Operations

- Are fluent with basic numerical and symbolic facts and algorithms, and are able to select and use appropriate (mental math, paper and pencil, and technology) methods based on an understanding of their efficiency, precision, and transparency
Formulate, represent, and use algorithms to add and subtract fractions with flexibility, accuracy, and efficiency

Use equivalent fractions as a strategy to add and subtract fractions.