A number uses "ten thousand" as the unit, and the approximate number obtained is 500,000. What is the maximum difference between this approximate number and the original number.
一个数用"万"做单位，得到的近似数是50万，这个近似数与原数最多相差多少．
<gadget id="calculator">50 * 10_000</gadget>
<output>500_000</output>

<gadget id="calculator">500_000 - 495_000</gadget>
<output>5_000</output>

<result>5_000</result>