There are 370 boys and 340 girls in the first grade of Chenguang Primary School. There are 398 people who have checked their bodies, how many people have not checked their bodies?
晨光小学一年级有男生370人，女生340人．已经检查身体的有398人，没检查身体的有多少人？
<gadget id="calculator">340 - 398</gadget>
<output>-58</output>

<gadget id="calculator">370 + (-58)</gadget>
<output>312</output>

<result>312</result>