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To look at it in the field is completely different than the math, but I would like to know, can anyone tell me mathematically how to solve the following questions.

75 foot long 1" EMT with two pull boxes requires how many support clips? (With the rules for pull box and 1" EMT distance)

80 foot 3/4" EMT with two NO boxes require how many support clips? (With rules for 3/4')

When I just do a simple divide, the answer I get for the first one is 11.49 but the right answer is 12.

When I do the second question, I get 16.25 but the right answer is 16.

So I am wondering, A) Can someone give me the breakdown to figure out each, so I can B) determine why in one answer you round up and the other, you round down?

Thank you.