Identify the correct fraction represented by the shaded portion of each shape.
Circle the correct fraction from the given choices. Four problems show shapes divided into parts with some shaded. Problem 1: Circle half shaded. Problem 2: Square divided into 4 parts, 3 shaded. Problem 3: Rectangle divided into 4 parts, 2 shaded. Problem 4: Triangle divided into 3 parts, 2 shaded.