Photoreading math books give your inner mind insights how to solve the maths problems. The conscious mind still requires regular practice at working out these problem. To this end activation of maths books is doing as many of the exercises provided in the maths book.
The benefit of photoreading a math book is that it is able to provide the conscious mind a breakthrough or better understanding of the math problems. Reducing some of the frustrations associated with learning to solve those maths problems. Most maths books are for practicing and self testing ones knowledge of how to solve them and an improved speed or ease at working out these problems accurately is probable, however activating a math book will take more time than activating a book for information because as you pointed out a math book has less emphasis on information and more on practice. So it is unlikely that you will work your way through the book like lightning.
Alex
