Classify the number −25. Venn diagram with outer loop labeled capital R, Real Numbers. Inside that loop is another loop divided into two parts. The right part is labeled capital I, Irrational Numbers. The left part is labeled capital Q, Rational Numbers. A loop inside the rational numbers loop is labeled capital Z, Integers. A loop inside the integers loop is labeled capital W, Whole Numbers. A loop inside the whole numbers loop is labeled N, Natural Numbers