For extracurricular activities, the students who play ball belong to the whole class (1/4), and the students who skip rope belong to the whole class (3/4). How many more students skip rope than those who play ball?
课外活动，打球的同学是全班同学的(1/4)，跳绳的同学是全班同学的(3/4)．跳绳的同学比打球的同学多多少？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(3/4) - (1/4)</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>