Xiao Ming reads a story book, and has already read (4/9) of the whole book, how much of it is left unread?
小明看一本故事书，已经看了全书的(4/9)，还剩下几分之几没有看？
<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">1 - (4/9)</gadget>
<output>5/9 = around 0.555556</output>

<result>5/9 = around 0.555556</result>