What is the answer the number of students in the four sixth grade classes at northside school are 261934 and 21 use a property to solve this?

To find the total number of students in the four sixth-grade classes at Northside School, we can use the associative property of addition. By grouping the numbers, we can simplify the calculation: (261,934 + 21) = 261,955. Therefore, the total number of students is 261,955.