Type of visa and is it all for single entry?

Hello, you should apply for visit entry permit with double entries to HK, an entry permit for travel purpose to Macau and a tourist L type to PRC. The three entry permits share some basic documents including the filled-out application form, recently-taken color photo, your passport and its photocopy as well as your valid residence in Singapore. Other relevant documents are a little bit different:
For HK: proof of your financial support such as salary bill, bank savings account or tax receipt, flight itinerary, and travel plan
For Macau: document of financial status, return tickets and hotel reservation receipts, proof of purpose of visit,
For PRC: hotel booking records and round trip air ticket