A square steel plate has a side length of 4 decimeters. If the steel plate weighs 980 grams per square decimeter, how much does the steel plate weigh in grams?
一块正方形钢板，边长4分米，如果每平方分米的钢板重980克，这块钢板重多少克？
<gadget id="calculator">4 * 4 * 980</gadget>
<output>15_680</output>

<result>15_680</result>