There are alot of beggars that crowd around the entrances of tourist attractions. Just be aware that pick pockets will watching out for supposedly rich tourists in famous attractions such as the; Forbidden City, Beijing Zoo, Summer Palace and Lama Temple.
Beggars are prevalent from Xi Dan all the way up to the third ring but, the worst are around Silk Alley. If you want to avoid the worst of it, at the Friendship Store take the side road and then the next right. You pass the American Consulate and will eventually end up at the back end of Silk Alley but, without having gone through all the beggars
Sellers and beggers is found everywhere. The sellers often will try to cheat you for money...and the beggers often use their kids to beg to get money...