Add and subtract positive and signed fractions with unlike denominators by finding common denominators, simplifying results, and expressing answers as fractions or mixed numbers; multiply fractions and mixed numbers, and divide whole numbers by positive proper fractions or mixed numbers using models and reciprocals. Convert among fractions, terminating decimals, repeating decimals, and percents by preserving equivalence, including decimals through thousandths and percents less than, equal to, or greater than 100%; express terminating decimals as simplified fractions with denominators of tenths, hundredths, or thousandths. Compare and order positive rational numbers represented as fractions, decimals, or percents using benchmarks, number lines, place value, or common representations, while reasoning about magnitude and proportional relationships.