Hi Elise,
We had the same question when our son took WIAT-III in Feb 2011. We couldn't figure out which one is "Total Math" since the test was administered at school, and they didn't have the answer either!
In WIAT-III report that we received, there are two separate composite scores for Mathematics and Math Fluency. My guess, by looking at the report, is that Math Fluency is a composite score for Math Fluency addition, subtraction and multiplication; while Mathematics is a composite for Math Problem Solving and Numerical Operations. Somebody please correct me if I'm wrong ...
We applied to DYS with this report and our son got in. Good luck!
