In a classroom, there are 6 3rd-grade students and 10 6th-grade students. Express the ratio of 3rd graders to the entire number of students

The total number of students is 6 + 10 = <<6+10=16>>16.

Therefore, the ratio of 3rd graders to the entire number of students is 6/16 or simplified as 3/8. Answer: \boxed{\frac{3}{8}}.

To express the ratio of 3rd graders to the entire number of students in the classroom, follow these steps:

Step 1: Add the number of 3rd-grade students and the number of 6th-grade students.
Total number of students = 6 (3rd-grade students) + 10 (6th-grade students) = 16 students

Step 2: Write the ratio by using the number of 3rd-grade students as the numerator and the total number of students as the denominator.
Ratio of 3rd graders to the entire number of students = 6 (Number of 3rd-grade students) : 16 (Total number of students)

Therefore, the ratio of 3rd graders to the entire number of students in the classroom is 6:16, which can be simplified to 3:8.

To express the ratio of 3rd graders to the entire number of students in the classroom, we need to calculate the total number of students first.

In this case, there are 6 3rd-grade students and 10 6th-grade students, so the total number of students is 6 + 10 = 16.

Next, we express the ratio of 3rd graders to the total number of students.

The ratio is calculated by dividing the number of 3rd graders (6) by the total number of students (16):

Ratio = Number of 3rd graders / Total number of students
= 6 / 16

Therefore, the ratio of 3rd graders to the entire number of students is 6/16.