As of 2015, some places that have free FCAT math practice for 10th graders include StudyGuideZone.com and the Florida Department of Education. Both of these are available online.
At StudyGuideZone.com, students find a variety of practice tests fro the FCAT, including a math section, reading practice and writing practice. There are 10 multiple-choice questions and an answer key with a small explanation. This website also offers a downloadable study guide for the FCAT that includes all the sections for free.
The Florida Department of Education website offers math practice tests based on grade level. Its information includes a test in a PDF format and an answer key that the students can download and print.