Qiangqiang’s weight at birth was 3.6 kg, and after 4 months it was 8 kg. How many kilograms does Qiangqiang’s weight increase every month on average?
强强出生时的体重是3.6千克，4个月后是8千克，强强的体重平均每月增长多少千克？
<gadget id="calculator">8 - 3.6</gadget>
<output>4.4</output>

<gadget id="calculator">4.4 / 4</gadget>
<output>1.1</output>

<result>1.1</result>