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 as a fraction.

To express the ratio of 3rd graders to the entire number of students as a fraction, you'll need to calculate the total number of students in the classroom.

The total number of students = number of 3rd graders + number of 6th graders
Total number of students = 6 + 10 = 16

Now, you can express the ratio as a fraction by dividing the number of 3rd graders by the total number of students:

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

Simplifying the fraction, you get:

Fraction = 3/8

So, the ratio of 3rd graders to the entire number of students is 3/8.

The entire number of students in the classroom is 6 + 10 = <<6+10=16>>16.

The ratio of 3rd graders to the entire number of students is 6/16 = <<6/16=3/8>>3/8. Answer: \boxed{\frac{3}{8}}.

To express the ratio of 3rd graders to the entire number of students as a fraction, you need to determine the total number of students in the classroom first.

To find the total number of students, you can add the number of 3rd-grade students and the number of 6th-grade students:

Total number of students = number of 3rd-grade students + number of 6th-grade students

In this case, the total number of students is 6 (the number of 3rd-grade students) + 10 (the number of 6th-grade students), which equals 16.

Now, you can express the ratio of 3rd graders to the entire number of students as a fraction. The number of 3rd graders represents the numerator of the fraction, and the total number of students represents the denominator.

Therefore, the fraction that represents the ratio of 3rd graders to the entire number of students is:

6 (the number of 3rd grade students)
---------------------------
16 (the total number of students)

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