9999*9999+19999.
9999*9999+19999．
<gadget id="calculator">9_999 * 9_999</gadget>
<output>99_980_001</output>

<gadget id="calculator">99_980_001 + 19_999</gadget>
<output>100_000_000</output>

<result>100_000_000</result>