You write 180 on a piece of paper, then put 127 on the bottom of 180. You borrow one from 8, then turn the one on 180 a 0. Then so on.
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Something = 180 - 127 = 53
-50
768 - (235 + 180) = 768 - 415 = 353
127 is one example.
Two angles are said to be supplementary if they total 180 degrees. To find an angle's supplement, subtract its measure from 180.