30
30 - 29 = 1
11/30 - 1/5 - 1/6 = 0
1/3 minus 3/10 is 1/30.
180 - 1 7/30 = 178 23/30
11/307/10 minus 1/3 is 11/30.
30/1
30/6 - 4 = 1
25/30 - 24/30 = 1/30
-30 - (-24) = -30 + 24 = -6
2/3 minus 6/10 = 1/15
29 - 1 will always equal 28. 29 - -1 will equal 30.