5×80

5×80 is a basic multiplication expression in decimal arithmetic. It represents the product of the integers 5 and 80, or five times eighty. Evaluating the expression yields 400, since 5 multiplied by 80 equals 400. Because multiplication is commutative, 5×80 equals 80×5, giving the same result.

In terms of factorization, 80 equals 2^4 × 5, so 5×80 equals 2^4 × 5^2, which is 400. The number 400 is a perfect square, being 20^2, and its prime factorization is 2^4 × 5^2. This highlights that the product arises from combining the prime factors of 5 and 80.

Applications of the product include area calculation and scaling. For example, a rectangle with sides 5 units and 80 units has an area of 400 square units. The expression also appears in budgeting, unit conversions, and various arithmetic problems where factors of 5 and 80 are involved.