This question already has an answer here:
I am an Indian and have multiple entry pass valid for the next 2 years. Suppose if I enter Singapore on a tourist visa on 23rd December and stayed for the next 30 days, i.e. till 23rd January. Now I leave or exit from Singapore on 22nd January to travel either to Malaysia or Indonesia for a 2-3 days trip, can I return to Singapore and then again stay for 30 days?