The expression "4 + 6" represents a simple addition problem in mathematics. In this case, the number 4 is combined with the number 6 to find the total. Addition is one of the basic operations in arithmetic, which is essential for understanding more complex mathematical concepts. When you add 4 and 6, you count the total amount of items represented by both numbers. Starting from 4, if you count up 6 more, you reach 10. Therefore, the result of "4 + 6" is 10, which is the sum of the two numbers.