In many parts of the US, it has long been possible to make local calls with just the seven-digit phone number; the three-digit area code was implicit for calls between numbers using the same area code ...

In two years, individuals in suicidal crisis seeking help will have a number that’s easy to remember and quick to dial to reach the National Suicide Prevention Lifeline. At its July open meeting ...

Build, read, write, and represent three-digit numbers using base-10 blocks and symbols. Build, read, write (in standard and expanded form), and represent three-digit numbers using base-10 blocks and ...