The toy factory needs to produce 1,500 toys, and 70% of them have been completed. How many pieces are left unfinished?
玩具厂要生产1500件玩具，已经完成70%，还剩下多少件没完成？
<gadget id="calculator">70 / 100</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">1 - (7/10)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1_500 * (3/10)</gadget>
<output>450</output>

<result>450</result>