The garment factory planned to produce a batch of children's clothing this month, but it was completed in the first half of the month (2/3), and the second half of the month was as much as the first half of the month. Is it overproduction? If overproduction, by what percentage?
服装厂本月计划生产一批童装，结果上半月完成了(2/3)，下半月和上半月完成的同样多，超产了吗？如果超产，超产了几分之几？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(2/3) - 1</gadget>
<output>-1/3 = around -0.333333</output>

<gadget id="calculator">(2/3) + (-1/3)</gadget>
<output>1/3 = around 0.333333</output>

<result>1/3 = around 0.333333</result>