Teacher Wang brought 500 yuan to buy footballs. The price of each football in the store is 58 yuan. If you want to buy 9 footballs. How much is still missing?
王老师带了500元钱去买足球，商店每个足球售价58元，如果要买9个足球．还缺多少元？
<gadget id="calculator">58 * 9</gadget>
<output>522</output>

<gadget id="calculator">522 - 500</gadget>
<output>22</output>

<result>22</result>