5×8

5 × 8 denotes the multiplication of the integer five by the integer eight. The operation follows the basic rules of arithmetic, yielding a product of 40. As multiplication is commutative, the expression can also be written as 8 × 5 with the same result. The calculation is often introduced in early education through the times table, where the row for eight lists the products 8, 16, 24, 32, 40, 48, 56, 64, 72, 80, and the row for five includes 5, 10, 15, 20, 25, 30, 35, 40, 45, 50; the intersecting entry is 40.

In practical contexts, 5 × 8 frequently appears in measurements and design. A rectangle measuring five units by eight units has an area of 40 square units, a size commonly encountered in flooring, paper formats, and graphic layouts. The product also serves as a convenient base for grouping objects, such as arranging 40 items into eight rows of five or five rows of eight.

From a number‑theoretic perspective, 40 is an even composite number with the prime factorisation 2³ × 5. It has six positive divisors (1, 2, 4, 5, 8, 10, 20, 40) and is the smallest number with exactly eight divisors when counting 1 and itself. The product 5 × 8 is also the sum of the first four even numbers (2 + 4 + 6 + 8 = 20) doubled, illustrating connections between addition and multiplication.