Xiao Ming reads a book, has read 35 pages, and has 45 pages left. How much of this book did Xiao Ming read?
小明看一本书，已经看了35页，还剩45页没看．小明看了这本书的几分之几？
<gadget id="calculator">35 + 45</gadget>
<output>80</output>

<gadget id="calculator">35 / 80</gadget>
<output>7/16 = around 0.4375</output>

<result>7/16 = around 0.4375</result>