And so what I'm showing you here, this is data from a pilot in the Los Altos school district, where they took two fifth-grade classes and two seventh-grade classes, and completely gutted their old math curriculum.
Så det her er data fra et forsøg i Los Altos skoledistrikt, med to 5. klasser og to 7. klasser hvor vi smed det gamle matematikpensum ud. Børnene her bruger ikke bøger,