1 and 13 will both divide 26 and 39 without remainder.
30
26
34.3077
6.5
Any multiple of 13 can be divided by 13 without a remainder. So, numbers like 13, 26, 39, 52, and so on fit the bill. Just keep multiplying 13 by any integer and you'll have yourself a number that can be divided by 13 with no leftovers. Easy peasy lemon squeezy!
8.6667
19.2308
Any number that can be divided evenly by 26 is a multiple of 26; i.e. 52, 78, 104, and130 can be divided by 26 with quotients of 2, 3, 4, and 5 respectively and without remainder. 26 itself is a multiple of 1 times 26 and of 2 times 13.
6.5
974 divided by 37 is 26 with remainder 12.
26.75
26.6667