I suspect that most people who excel at this type of mental math use a method similar to the number line diagram that is shown (the supposedly laughable Common Core example). The ability to ...

After a delay of nearly a week, the Florida Department of Education has released examples that it says ... based on critical race theory or Common Core. The state did not identify which textbooks ...

and the Common Core State Standards for ELA and Mathematics. This crosswalk also describes what literacy support looks like with classroom examples at the novice, intermediate, and advanced levels.