waste battery in the soil will cause about 140 square decimeters of land pollution. During the "Environmental Protection in Mind" activity, the students of Class 6 and 1 picked up 58 waste batteries a day, which reduced how many square decimeters of land pollution.
一节废电池在土壤里会造成周围大约140平方分米土地污染，六1班同学在"环保在心中"活动中，一天就拾起58节废旧电池，这样减少了多少平方分米土地污染．
<gadget id="calculator">140 * 58</gadget>
<output>8_120</output>

<result>8_120</result>