The red-crowned crane is a national first-class protected animal. In 2001, there were about 2,000 wild red-crowned cranes in the world, including about 500 in my country. The number of wild red-crowned cranes in my country accounts for about a fraction of the world's total?
丹顶鹤是国家一级保护动物，2001年全世界野生丹顶鹤约有2000只，其中我国约有500只．我国野生丹顶鹤的数量约占全世界的几分之几？
<gadget id="calculator">500 / 2_000</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>