There are 156 skipping ropes in the sports group, and 5 groups of children participate in the rope skipping competition. Each group needs 8 skipping ropes. Ask: How many skipping ropes are left?
体育组共有156根跳绳，5组小朋友参加跳绳比赛，每组需要8根跳绳，问：还剩下多少根跳绳？
<gadget id="calculator">5 * 8</gadget>
<output>40</output>

<gadget id="calculator">156 - 40</gadget>
<output>116</output>

<result>116</result>