1/8 as a whole number is 0. Since 1/8 is a fraction less than 1, it cannot be expressed as a whole number. Whole numbers are integers starting from 0 and increasing by 1 (e.g., 0, 1, 2, 3, etc.). Fractions like 1/8 represent parts of a whole and do not correspond to any whole number unless they are equal to or greater than 1.