The whole family eats watermelon together, mother eats the whole watermelon (3/8), father eats the whole watermelon (2/8), and Xiao Ming eats the rest. How much of this watermelon did Xiao Ming eat?
全家人一起吃西瓜，妈妈吃了整个西瓜的(3/8)，爸爸吃了整个西瓜的(2/8)，余下的小明吃了．小明吃了这个西瓜的几分之几？
<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>