Measuring Angles

By the end of grade 4 students need to successfully identify and measure angles.
They need to be able to identify an angle as being acute, right, or obtuse. Further they also need to measure different angles using a protractor.  Using a protractor correctly requires precision and patience. Some are experiencing difficulty and need extra practice.

Here is a link that offers practice with a protractor.
http://www.mathplayground.com/measuringangles.html

For some more challenging practice...
http://www.mathplayground.com/alienangles.html

Some cues and tips we use during class are:
1. Make sure you are using a flat surface.
2. Line up the baseline of your protractor with the baseline of your angle.
3. Use your eyes to determine what type of angle you are looking at (acute, right, obtuse)
4. Then use your protractor to measure the angle in degrees.

Remember:
Right angles will always be 90 degrees.
Acute angles will always be between 1 and 89 degrees
Obtuse angles will always be between 91 and 179 degrees