1. **State the problem:** Calculate the value of the expression $0.1809 - 2.81 + 1.1883$. 2. **Apply the order of operations:** Since this is a simple addition and subtraction from left to right, we proceed stepwise. 3. **Calculate the first subtraction:** $$0.1809 - 2.81 = -2.6291$$ 4. **Add the last term:** $$-2.6291 + 1.1883 = -1.4408$$ 5. **Final answer:** $$\boxed{-1.4408}$$ This means the result of the expression is $-1.4408$.