For a three-digit number, the hundreds digit is 4, the tens digit is 2, and the ones digit is 0. What is the multiple of 5?
一个三位数，百位上是4，十位上是2，个位上是0，它的5倍是多少．
<gadget id="calculator">420 * 5</gadget>
<output>2_100</output>

<result>2_100</result>