Fractions represent parts of a whole. They are written with a numerator above a denominator, where the numerator indicates the number of parts and the denominator indicates the total number of parts making up the whole. For example, in the fraction 1/4, the numerator 1 represents one part and the denominator 4 represents that the whole is divided into four equal parts. Students are asked to identify fractions of groups, such as what fraction of students are boys or have brown hair, and to represent the fractions with a pie chart.