2+4+6+8+...+198.
2+4+6+8+…+198．
<gadget id="calculator">2 + 198</gadget>
<output>200</output>

<gadget id="calculator">99 / 2</gadget>
<output>99/2 = around 49.5</output>

<gadget id="calculator">200 * (99/2)</gadget>
<output>9_900</output>

<result>9_900</result>