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Measuring.length units .Metric System.

 

 

 

  1. What is the metric system?

The metric system is an internationally agreed  decimal system  of measuremente of units based on the metre as unit length.  It´s the official system of measurement in almost every country in the world, except the United States and the United Kingdom in some cases.

The meter is the main unit of lenght, but not the only one. We are going to refresh some other units of length of the metric system and practice with them:

 

Metric system: units of distance: Sal discusses metric units of length or distance such as millimeter, centimeter, meter, and kilometer.

 

2.CONVERTING  UNITS WITHIN THE METRIC SYSTEM

 As we have said, the meter is the main unit of length of the metric system, but sometimes the metter is not suitable to measure some objects because they are too small ( a pencil, a finger, a spoon..) or maybe the length is too large, for example,in the case of distances between two points, cities or countries.

 

 

 

 So that, we need to know other units of lenght of the metric system and how to work with them to get our purposes.These are the most important ones:

KILOMETER HECTOMETER DEKAMETER METER DECIMETER CENTIMETER MILIMETER

The metric system of measurement is based on powers of ten and uses the following prefixes:

KILO -  meaning 1000

CENTI- meaning one hundredth

MILI- meaning one thousandth

MICRO -meaning one milliondth

These prefixes are the followed by a base unit.

The base unit for lenght is METER

 To convert this units within the metric system, we have to multiplicate or to divide following this simple diagram:

Converting units: metric distance: Sal orders 1 decameter, 13 meters, 15,000 millimeters, and 1900 centimeters from least to greatest. 

 

3. PRACTICE. EXERCISES

3.1 EXERCISE 1

It´s time to work! Please look at exercise number 1. Working in pairs, calculate some of that distances
between the places listed in the exercise. You can use the buttom text calculate distances to determinate the results.

3.2 PRACTICE WITH THE METRIC SYSTEM.

Please, press the button text with the same name, and try to complete the questions.Check your answers and share your score with your classmates.

3.3 EXERCISE 2.

It´s time to demonstrate all that you have learnt. Use your brain and complete the exercise number 3.Likely your are an expert about metric system.

 

 

 

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