$$\frac{ 1 }{ 4 } + \frac{ 1 }{ 2 } - \frac{ 1 }{ 1 }$$
$-\frac{1}{4}=-0.25$
$$\frac{1}{4}+\frac{1}{2}-1$$
$$\frac{1}{4}+\frac{2}{4}-1$$
$$\frac{1+2}{4}-1$$
$$\frac{3}{4}-1$$
$$\frac{3}{4}-\frac{4}{4}$$
$$\frac{3-4}{4}$$
$$-\frac{1}{4}$$
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$-\frac{1}{4} = -0.25$