All mainstream credit card numbers obey a mathematical trick designed to catch the most common typos. It’s called the Luhn ...

Sample questions students were asked as part of the “1992 Mathematics Report Card for the Nation and the States.” Students were tested at three achievement levels, each more difficult than the ...

The Nation's Report Card, a federal program administered by an arm of the U.S. Department of Education, assigns target scores for four potential levels of achievement in math and reading — Below ...

But guess what? The math credit card issuers use can still be confusing. “It is never really easy to figure it out,” says Riley. Take a $2,100 credit card balance at 17.9%.