Which part of china is most populated

Shanghai (上海), is China's most populous city situated on the eastern coast of the country, a port on the estuary of the Yangtze River.

Until World War II, Shanghai contained areas of British, French, and American settlement.

the value of the 4 in the hundreds place is 400 while the value of th e 4 in the tens place is 40

400 is way bigger than 40.