Once you know the basic idea trying to find the area of a circle can be easy. This article will show you how to quickly and easily find the area of a circle.

There are many methods of calculating the ideal body weight, but the body mass index (BMI) is one of the most common. This method compares a person's weight to their height and is performed on people of all ages. This number is then compared to reference values in adults; however, in children the BMI is compared to those of other children with the same age. The BMI does not determine a child's ideal weight by itself and should be used in conjunction with many other factors.

Scientifically speaking, there is a difference between the "mass" of an object and the "weight" of an object. Mass refers to an object's matter; weight is the measure of how much force gravity pulls on that object. Because of this difference, to measure mass you need a tool that is not affected by gravity. To measure the mass of a ball bearing, for example, you need to place the ball bearing onto a triple-beam balance scale. This scale will provide you with the closest measure of mass.

Most classrooms I have been in the last 3 or 4 years have already adopted some type of this material, though all may not call them data folders. A data folder is a collection of student work and progress, which may also include graphs, parent signature sheets, student reflection pages, etc.

I like to use my data folders as a student reflection piece that the parent(s) must sign off on every 2-3 weeks. This is more up-to-date than mid-quarter interim reports, but not so cumbersome that I dread doing it every week. Plus, then the students do not get bored with the idea of doing them as a weekly matter of chore.

There are many pieces that could possibly go into a data folder, and it is discretion to decide what will best elaborate on students' learning. Ask other teachers or search for examples on the Internet, and you are sure to see many possibilities.

My data folders are used to highlight what I feel the most important skills are in my classroom, which maybe different for you. Here is an example of my current data folder:

Molecular size is a measure of the area a molecule occupies in three-dimensional space. The amount of space any mass takes up in three-dimensional space is known specifically as its volume. Using algebra and the density formula discovered by Archimedes of Syracuse, one can determine the molecular size of a molecule for any given mass of molecular substance.