The expression "4 × 6" represents a multiplication problem where the number 4 is multiplied by the number 6. This operation is a basic arithmetic calculation that results in the total number of items when you have 4 groups of 6 items each. When you calculate "4 × 6," you find that the answer is 24. This means that if you have 4 sets of something, and each set contains 6 items, you will have a total of 24 items. This concept is fundamental in mathematics and is often used in various real-life situations, such as counting objects or organizing groups.