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}}.
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
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