I wrote my first academic paper recently (it is in math). I need to put a footnote crediting the NSF for funding. I have noticed that papers almost always say "Partially supported by [grant]". I got all of my funding from one grant. Should I still say partially supported? If so, what is the reason for this?
The NSF requires the following text (or its equivalent) in publications from work funded by their grants:
"This material is based upon work supported by the National Science Foundation under Grant No. (grantee must enter NSF grant number)."
No need to quantify the level of support.
Some grants come with more strict requirements than others. I am aware of at least one funding body, that requests to specifically explain which part of the work was supported by this grant (and you can not just say "a part"). Others are satisfied if you just mention them. Read the funding agreement and follow their guidelines.