When you estimate a number you decide approximately, or roughly, how big that number is. To estimate accurately, you need to have a good understanding of the value and order of numbers. A number line ...

This is possibly a dumb question. I'm trying to do this with numbers in the ipad as I want to learn it (have access to Numbers on a Mac Mini also as well as work computer using excel but I realized ...

Graph crossing numbers quantify the minimum number of edge intersections in any planar drawing of a graph, an essential parameter in both theoretical and applied graph theory. The study of crossing ...