A piece of paper, Xiaoming used up (3/8), Xiaohong used up (4/8), what fraction of this piece of paper is left?
一张纸，小明用去了(3/8)，小红用去了(4/8)，还剩这张纸的几分之几？
<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">4 / 8</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 - (3/8) - (1/2)</gadget>
<output>1/8 = around 0.125</output>

<result>1/8 = around 0.125</result>