The next would be 7. 100 minus 48 is 52. 52 minus 24 (half of 48) is 28. 28 minus 12 (half of 24) is 16. etc.. The next in the sequence after 7 would be 5.5.
If those are all minus signs, that equals -61.
52 minus 26 is 26.
If you want 52 minus 25% of 52, then multiply 52 by .25 and subtract the result from 52.
365 times 52 minus 52 plus 1 = 18,929
52
52 - 47 = 5
52 - 18 = 34
52 - 44 = 8
52 - 12 = 40
52 - 29 = 23
87 - 52 = 35