2,013 minus 30 is 1,983.
-30 - (-24) = -30 + 24 = -6
2013 minus 1958 = 55
-30 minus -6 is -24
30 minus 11 is 19.
4 minus 30 is -26.
38
-18
Minus 30
30 minus 90 is negative 60, if I'm correct.
2,013 minus 1,936 is 77.
1,993 minus 2,013 is -20.
2,013 minus 1,912 is 101.