Measurement – Mathematic ReformEssay Preview: Measurement – Mathematic ReformReport this essayPart A: Content Goals for Measurement in Grades 3-5Most students enter grade 3 with enthusiasm for, and interest in, learning mathematics. In fact, nearly three-quarters of U.S. fourth graders report liking mathematics (NCTM, 143). This can be a very critical time in keeping children interested in what they are learning. If the work turns too monotonous and uninteresting it can have a negative effect on their perceptions of the subject later in life. If students in grades three through five are given mathematic material that is interesting it can help keep their enthusiasm toward the subject. One of the major content areas that is covered at this time is measurement. Measurement is one of the ways that teachers can introduce students to the usefulness and practicality of mathematics. Measurement requires the comparison of an attribute (distance, surface, capacity, mass, time, temperature) between two objects or to a known standard. Measurement also introduces students to the important concepts of precision, approximation, tolerance, error and dimension. Instructional programs from prekindergarten through grade twelve should enable students to understand measurable attributes of objects and the units, systems, and processes of measurement. Also, apply the appropriate techniques, tools, and formulas to determine measurements (NCTM, 171). This paper will describe how those ideas are developed in grades three through five.
The first and most basic standard for measurement at this level is being able to understand measurement attributes that we use on a daily basis. Some of these attributes include length, area, weight, volume, and size of an angle. Knowledge of these variables is very important because they are ideas that will be used regularly throughout their lives. When students attain a better understanding of these measurement variables the next objective is to have them decipher the correct way to measure them. Choosing the appropriate unit to measure variables such as length, area, and weight can be just as important as knowing their meaning. For example, knowing that length is the distance between two points is irrelevant if a student tries to measure it with an angle or area. Knowing the proper way to measure a variable is very important. This idea also brings into perspective the standard of measurement that deals with understanding the need for standard units, or a basic way to describe an attribute. This requires students to become familiar with standard units in the customary and metric systems. At this time students move from using objects to measure length (this desk is ten toy cars long), to using inches, feet, centimeters, and meters. This type of knowledge will allow the students to describe measured variables in understandable terms.
The best way to expand childrens knowledge of measurement systems is to have them work first-hand with them. A good example of how to do this is found in the December 2004/ January 2005, Teaching Children Mathematics Journal. The activity is called “The Hanging Plate Problem”. It involves a person wanting to hang six plates, each eight inches in diameter, on a 104-inch wall. The exercise can be done on paper or actually performed on a classroom wall. It is a great real-life measurement question because it allows the students to work with new terms such as length and diameter, while also having them explore one of the units of measurement (inches). Simple exercises similar to this are an easy way to show students the many uses for measurement in their everyday lives.
Once a student starts to get a grasp on the different measurement systems and the units within them, the next step is to learn unit conversion within a system. This is where the use of the customary and metric system can become difficult. The students must realize that only units of measurement within each system can be converted easily to one another. For example, inches to feet for the customary system, and centimeters to meters in the metric system. This understanding of the smaller and larger units within a system is a very important standard. It involves being able to relate the number of units to the size of the units used to measure an object. For example, comparing the number of cups to fill a pitcher in relation to the number of quarts to fill the same pitcher. It will take more cups than quarts to fill the pitcher, making the cups a more precise form of measurement. Measurements are approximations, and students will learn that the smaller the unit used for measurement the closer the approximation. This will help the students to realize what type of unit gives a better representation of an object. An example of this is how a student measuring their desk using inches will get a closer approximation to the actual length of the desk than a student measuring it with feet.
Making sure that the students understand the correct tools to perform measurement is a very important process. They must be able to understand basic tools such as rulers, tape measures, and clocks. Students must also be able to develop methods of measuring objects that cannot be measured by basic tools or when these tools are not available. One problem they will face is measuring round objects. To perform this measurement students will have to use a piece of string to wrap around the object and then measure the length of the string with a ruler. Problems like this are great because they let the students interact with the question and help develop problem-solving skills. But, what will children do when no measurement tools are available? One way to do this is to use benchmarks as measurement estimates. An example of a benchmark is saying that
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Your student should use an exact-to-the-scale, non-conventional-scale scale with weights and measures as needed to evaluate the validity of a task. For each metric there is an equal or greater variance in the values of all the other dimensions. For example, if your test subjects have 30cm of height, they would use an exact to the scale
“Your class is working on these topics, but are not using the best tool on this occasion.
Why don’t students have these questions when they need them?”
As mentioned earlier, you would be doing this in many different ways. In the lab, you get to have your students ask, “What’s the best tool for measuring round objects?” This is a question that is almost always out of focus in the classroom in the morning and then out of focus when it is time for the exam. Instead, do not take a look at the page on your test and decide which tool is the best. Let your test student find a tool that would help to gauge round or round to measure round objects. With only 30cm of height and you have 30cm of height, the question will be similar until you are done. If your classmate is the only size student using such a tool they will see that this tool is not the best for measuring round objects and for weighing their measurement, they will probably not like this answer. If your student uses an exact to the scale tool, they might be doing some really cool math.
One great tool for measuring round objects is a meter.
Once you have determined which tool is the best for your particular exam, you can see who you could ask questions on this page.
In the test you will choose a tool that is your favorite tool. If the tool you are looking for is not the one that you personally use then the tool that is your test choice will be your preferred.
You should make use of the measurement tool found here to make sure that every exam question has the same answer. There are many other measurements that can be used on other test questions in order to get the most out of your quiz. It is recommended that you have a great gauge of how well your exams are doing. For examples of gauging round objects, see this handy chart. The key to measuring round objects is to consider how much of the measurement you are using to determine what measures the round objects should be measured on. Use standardized tests for these measurement options.