A prime number is a positive number that has only two factors: 1 and the number itself. Zero is not prime because it has many factors (any number times zero is zero). One is not prime because it only has one factor: the number 1. The only even prime number is 2 since any [...]

In a nutshell, Algebra is arithmetic using known and unknown quantities. These unknown quantities are called variables and are represented as a letter (x) or a symbol. You have already evaluated some algebraic expressions by substituting certain values for some or all of the variables within the expression. Now, let’s apply what we know [...]

The Upper Level ISEE is used for application into 9th through 12th grade. Thus, the ISEE sometimes includes some higher level math concepts designed for students who have completed Algebra II or Pre‐Calculus. We have included three of these concepts so that you know what they look like so you can determine for yourself [...]

Polygons are two‐dimensional shapes that are formed by three or more straight sides. You will be analyzing these geometric figures to find the total degree value of a polygon, the perimeter of a polygon, and the area of a polygon. The perimeter is the measurement of the sum of the side lengths of a [...]

Like rate, time, and distance questions, work word problems are interested in how long it will take individuals, or workers, to complete a project alone or as a group. The idea here is that it takes a worker a certain amount of time to complete a job. If another worker joins his or her [...]

Triangles, polygons, and circles are all considered two‐dimensional objects, and you’ve learned how to find the perimeter and area of these objects. You will also need to know how to analyze the measurements of their three‐dimensional counterparts, or solid geometry. For solid geometry, you will need to know the volume and the surface area [...]

The United States uses what is known as the U.S. Customary Units, a variation of the Imperial system, for its measurement values. Most of the rest of the world uses the International System of Units, the modern iteration of the Metric system. The ERB will likely provide some conversions and values for U.S. Customary [...]

An angle is formed when two rays share the same endpoint, which is called the vertex of the angle. In geometric notation, the vertex is the middle letter in the name of the angle. Each angle has a degree value, which is the measurement of the size of the angle, and the degree value [...]

For the ISEE and other standardized tests with math sections, estimation is your friend. Estimation will reduce the amount of time you spend making calculations, which allows more time to complete difficult questions. Estimation is rounding a number up or down to make it easier to calculate, but the estimated number must be as [...]