The expression "2x8" represents a multiplication problem where the number 2 is multiplied by the number 8. In mathematical terms, this means adding the number 2 to itself a total of 8 times. The result of this multiplication is 16, which is the product of 2 and 8. In practical applications, "2x8" can also refer to a common size of lumber used in construction. A 2x8 board is typically 2 inches thick and 8 inches wide, often used for framing and structural support in buildings. This size is popular due to its strength and versatility.