Basic Statistics > Significant DigitsSignificant digits refers to how many important or interesting digits there are in a number. For example:- 221 = 3 sig. digits- 2212 = 4 sig. digits- 2211.1 = 5 sig. digits- 0.0022 = 2 sig. digits. We aren’t ever interested in leading zeros. Need help with a homework or test question? With Chegg Study, you can get step-by-step solutions to your questions from an expert in the field. Your first 30 minutes with a Chegg tutor is free! Comments? Need to post a correction? Please post a comment on our Facebook page.