Refresh your knowledge with these guides on place value and calculations with whole numbers. Write the numbers one underneath the other, lining up the units place value digits. Start on the left to ...

Ever wanted to impress everyone by solving complex multiplication problems in your head, without needing a pencil or paper? It's not magic; it's mental math—a superpower you can learn! This article is ...

Cell phones, fax machines and pagers are dialing through the country's supply of phone numbers. The Federal Communications Commission, aware of the dwindling supply of 10-digit phone numbers and ...