Sunshine Supermarket bought 18 boxes of children's toothpaste, 25 boxes per box, and each box sold for 4 yuan. How much can these children's toothpaste sell?
阳光超市购进18箱儿童牙膏，每箱25盒，每盒卖4元钱．这些儿童牙膏可卖多少元？
<gadget id="calculator">18 * 25</gadget>
<output>450</output>

<gadget id="calculator">4 * 450</gadget>
<output>1_800</output>

<result>1_800</result>