This document discusses common size statements, which convert financial statement figures into percentages of a common base for comparison. It defines common size statements and explains their objectives are to study trends in income/expense items and changes in individual income statement items. Formulas for calculating common size percentages are provided. The key types are common size income statements and balance sheets. Examples of common size income statements and balance sheet formats are shown, along with an example income statement. Advantages include ease of understanding and comparing performance over time or between firms. Limitations include not accounting for changes in price levels or accounting standards.