A long-standing puzzle seems to constrain how addition and multiplication relate to each other. A graduate student has gone further than anyone else in establishing the connection. In 1983 the ...

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 ...

Math can be tricky sometimes. Let's say you're adding several large numbers together, and you get an answer that you think is correct. How do you make sure? The simplest way to check your answer is to ...