Xiaohong's father bought a big cake, distributed it to Xiaohong (2/4), distributed it to her mother (1/4), and kept the rest for herself. How much is her father's share?
小红的爸爸买来一个大蛋糕，分给小红了(2/4)，分给妈妈了(1/4)，剩下的留给了自己，爸爸自己分得几分之几？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">2 / 4</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 - (1/4) - (1/2)</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>