SMP Interact is a major new mathematics course for Key Stages 3 and 4. The Key Stage 3 books have been written to support the new Framework for Teaching Mathematics; Years 7, 8 and 9, both in its specific content and in its general interactive approach to teaching. All the materials have been fully trialled in the classroom, and working teachers from a wide variety of schools have been involved at all stages of writing, trialling, and improving. Practice for Book S2 accompanies the second book of the S (Square) series, which provides a route to the Key Stage 3 SATs at levels 4-6. Suitable for use in class, it is also ideal as an inexpensive homework resource, especially when the school does not let pupils take textbooks home.