Xiaohong planned to practice 700 Chinese characters per week (7 days), but actually practiced 120 characters per day. How many more characters did she practice per week than planned?
小红计划每星期(7天)练700个汉字，实际每天练120个字，实际每星期比计划多练几个字？
<gadget id="calculator">120 * 7</gadget>
<output>840</output>

<gadget id="calculator">840 - 700</gadget>
<output>140</output>

<result>140</result>