Calculation: 666*778+333*444=how much.
计算：666*778+333*444=多少．
<gadget id="calculator">666 * 778</gadget>
<output>518_148</output>

<gadget id="calculator">333 * 444</gadget>
<output>147_852</output>

<gadget id="calculator">518_148 + 147_852</gadget>
<output>666_000</output>

<result>666_000</result>