In the third grade of Chenguang Primary School, there are 279 boys and 224 girls, 396 have taken the physical examination, and how many have not taken the physical examination?
晨光小学三年级有男生279人，女生有224人，已经参加体检的有396人，没有参加体检的有多少人？
<gadget id="calculator">224 - 396</gadget>
<output>-172</output>

<gadget id="calculator">279 + (-172)</gadget>
<output>107</output>

<result>107</result>