5×4

5×4 denotes the product of the integers five and four. The result is twenty. In standard arithmetic it is written as 5 × 4 = 20. Because multiplication is commutative, 5×4 = 4×5 = 20. It can be viewed as repeated addition: four copies of five added together, or five copies of four.

Numerical representations of the result include decimal 20; Roman numeral XX; binary 10100; and hexadecimal 14. The prime factorization of 20 is 2^2 × 5, and its divisors are 1, 2, 4, 5, 10, and 20. As a composite number, 20 sits within common discussions of multiplication tables and basic number theory.

Applications of 5×4 include determining the area of a rectangle: a 5 by 4 rectangle has an area of 20 square units. In educational contexts, 5×4 is a standard entry in the 4 times table and the 5 times table, used to teach multiplication facts and the concept of area.

Symbolically, the × sign is the conventional multiplication sign in many countries; alternatives include the dot operator · or the letter x in informal contexts. The symbol × has been used to denote multiplication since the early modern period, with its use popularized by mathematicians and typesetters. In computing and some programming languages, the asterisk (*) is often used to denote multiplication instead of ×.