39 campers are going on a field trip. Campers will be divided into groups of 6 and there will be 1 camp counselor assigned to each group. What is the least number of camp counselors that will be needed?
To determine the least number of camp counselors needed, we need to divide the total number of campers by the maximum number of campers per group (6).
So, 39 campers divided by 6 campers per group gives us a quotient of 6 with a remainder of 3.
Since the remainder is greater than 0, we need to include an extra group with fewer than 6 campers.
Therefore, the least number of camp counselors needed is 6 + 1 = <<6+1=7>>7 camp counselors. Answer: \boxed{7}.