Expressed as a proper fraction in its simplest form, 3/15 + 12/18 = 13/15 or thirteen fifteenths. Expressed as a decimal, this is equal to 0.86 recurring (that is, 0.86666...)
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It is: (15+18)+12 = 45
-12 + 18 - (-15) = -12 + 18 +15 = 21
2/12 + 4/18 = 7/18
-12
5/6 + 9/1 + 2/3 --> 15/18 + 162/18 + 12/18 = 189/18 --> 10 9/18 --> 10 1/2