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Jon teaches a fourth grade class at an elementary school where class sizes are always at least 10 students and at most 15.  One day Jon decides that he wants to arrange the students in their desks in a rectangular grid with no gaps.  Unfortunately for Jon he discovers that doing so could only result in one straight line of desks.  What is the largest number of students that Jon could have in his class?

 Jul 14, 2024
 #1
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The prime numbers between 10 and 15, inclusive, are 11 and 13.   

So the largest possible number of students in Jon's class is 13.   

Any number other than a prime number can be divided.   

.

 Jul 14, 2024

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