Book excerpt: Eureka helps students to truly understand math, connect it to the real world, and prepare them to solve problems they haven't encountered before. The team of teachers and mathematicians who created Eureka Math believe that it is not enough for students to know the process for solving a problem; they need to know why that process works. Eureka presents math as a story, one that develops from grades PK through 12. In A Story of Units, our elementary curriculum, this sequencing has joined with the methods of instruction that have been proven to work, in this nation and abroad.