A piece of cake is divided into 8 portions on average, father eats 3 portions, mother eats 2 portions, and the rest is for Xiao Ming, what fraction of the cake does Xiao Ming eat?
一块蛋糕平均分成8份，爸爸吃了3份，妈妈吃了2份，剩下的给小明吃，小明吃了这块蛋糕的几分之几？
<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">2 / 8</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (3/8) - (1/4)</gadget>
<output>3/8 = around 0.375</output>

<result>3/8 = around 0.375</result>