Maths? and Science Knowledge

Reading this press release,says U.S. students "trail in maths and science knowledge" compared to kids in other peer nations.  No surprise there, except for the use of "maths" instead of math.  Perhaps this is a language difference (this is the "worldwide" version of the web site), or maybe "maths" is correct because there are different flavors of math.  Dunno, but the plural of math threw me off.  CNN version of the story here.  No plural of math.