Students learn how to write an equation to find the area of rectangles. In this lesson, students will learn how to write an equation to find the area of rectangles by thinking of them as an array. / ...

We like to think that we're pretty good at math, especially after years of schooling. But every once in a while, a simple third-grade math problem manages to trip us up and make us question our ...

Third grade was a long time ago, and many of us have forgotten even the most basic of principles. Fortunately, they’re pretty easy to remember, and calculators are ready and available now. A review is ...