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

Answer 1

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}}.