There were 640 students in Hongqi Primary School last year, and this year it has increased (1/8) compared to last year. How many students have increased this year?
红旗小学去年在校学生有640名，今年比去年增加了(1/8)，今年增加多少人？
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">640 * (1/8)</gadget>
<output>80</output>

<result>80</result>