A key part—though surely not the only part—of early-grades math is ensuring students get the basic arithmetic functions down and, beyond that, making sure they’re able to swiftly and automatically ...

It’s no shocker that Harry and Hermione would know that 4 – 1 = 3. But what if I told you that this Harry and Hermione aren’t characters in Harry Potter stories — they’re stingrays. And they can still ...

In grade school, you were probably constantly drilled on mathematics. Whether it be multiplication tables, simple addition, or complicated division, it was taught over and over again that quick math ...