To convert octal 210 to decimal: 0 * 8^0 = 0 * 1 = 0 1 * 8^1 = 1 * 8 = 8 2 * 8^2 = 2 * 64 = 128 Adding these results: 0 + 8 + 128 = 136. Therefore, octal 210 is equal to decimal 136.