Via a reader, interested in this issue:

Jessica Blanchard:

When Seattle elementary-schoolers open their math textbooks this fall, they’ll all be on the same page — literally.
In an attempt to boost stagnant test scores, elementary teachers will start using the same math textbooks and materials and covering lessons at the same time as their colleagues at other Seattle elementary schools, the School Board decided Wednesday.
“It’s clear to me that the math adoption is long overdue, and Seattle desperately needs a consistent and balanced approach,” board member Brita Butler-Wall said.
Lessons will now be taught using the conceptual “Everyday Math” books, which help students discover algorithms on their own and explore multiple ways to solve problems, and the more traditional “Singapore Math” books, which help hone students’ basic computation skills through repetition and problem solving. Teachers will follow the district’s guidelines for the order the lessons would be taught.