Do math drills help children learn?

One of the most hotly contested teaching practices concerns a single minute of math class.
Should teachers pull out their stopwatches and administer one-page worksheets in addition, subtraction, multiplication and division? Speed drills are such a routine part of the weekly rhythms of many math classrooms that they’re often called Mad Minute Mondays. Critics say these timed drills aren’t useful and instead provoke math anxiety in many children. The National Council of Teachers of Mathematics urges teachers to “avoid” timed tests. But advocates insist that these tests, which last one to five minutes, help children memorize math facts, freeing up their brains to tackle more challenging math problems.
This long-running debate captured my attention again because a group of more than a dozen education researchers, who founded an organization they call the “Science of Math,” declared that the stopwatch skeptics are wrong. The researchers built an entire webpage to set the record straight..