Problem solving tends to be messy. Every problem is different, and each one calls for a slightly different approach. Unfortunately, students often have erroneous ideas about what it takes to be good at problem solving, such as “good problem solvers do everything in their heads,” which makes problem solving even more difficult. The first sections of this chapter highlight helpful skills for solving problems that teachers can teach students. These skills include using manipulatives and aids, working outside the boundaries, detecting patterns and sequences, working backward, and making estimations and approximations. The final section of this chapter takes a look at guidelines and strategies for incorporating problem solving into science lessons. Additional practice problems for both teachers and students are included at the end of the chapter.