## Math Tutor in San Diego

Mathematics is one of the most popular subjects where tutoring is requested. This blog shows readers how one great tutor goes about working his magic on numbers.

### Featured Posts

#### Comparing rectangles by their area and by their diagonal

The other day I was in someone’s office waiting for some paperwork to be completed. It was a small room, about 12 feet by 12 feet. The back wall was orange, and its lower part was horizontally covered by a desk. In the middle of the orange wall there was a picture of a green car. I thought that was an interesting color combination. Looking at the picture on the wall, I wondered how bigger the

#### A very cool property of binomial coefficients

Last night I was reading a post in this other blog, by Ben Vitale. His post is about some special types of binomial coefficients. In case you don’t remember, given two non-negative integers m and r, their binomial coefficient C(m,r) (also known as “m chose r”) counts the number of subsets of size r out of a set of size m, and it is calculated by the formula: C(m,r) = m!/(r!•(m-r)!) In

#### Powers of 2

From my early days as an undergrad math student, I knew that powers of 2, the numbers of the form 2n, have many properties, and are very important in many areas of mathematics. However, it was only after I became a math tutor that I realized how common questions involving powers of 2 are in standardized tests. Before becoming a math tutor I had held positions at colleges and high schools as an