The teacher of a multigrade self-contained special education classroom considers the needs and abilities of the following students to group them for an upcoming mathematics lesson.
Student 1 is a first grader with the following IEP goal. "Given paper circles and squares, the student will fold the papers and identify one-half and one-fourth of the whole with at least 80% accuracy."
Student 2 is a second grader with the following IEP goal. "Given a variety of concrete fraction models of halves, fourths, and eighths, the student will correctly name the fractional parts with at least 80% accuracy."
Student 3 is a third grader with the following IEP goal. "Given a set of ten one-step problems involving addition and subtraction of fractions with like denominators, the student will solve them with at least 80% accuracy."
Student 4 is a fourth grader with the following IEP goal. "When shown the first two steps of a pattern, the student will extend the pattern twice with 80% accuracy on three consecutive days."
Based on the students' IEP goals, which of the following grouping formats is most appropriate?