How many significant figures are in 0.260?

Thank you! I need this for my pre-lab.. I thought it was three but it's not. SO I'm guessing two? I just want to make sure before submitting anything. So after doing calculations with that number.. I got an answer of 0.00002148. Then I tried 0.0000215 but it was wrong. What did I do wrong here? The answer is right but I just have the wrong amount of sig figs.. help?