When we are estimating the measure of an angle, we are simply guessing the value based on our experience with angles. There are a number of methods we can use to improve our chances. It all starts understanding a right angle which always indicates a ninety-degree measure. If the angle is less than a right angle or greater than a right angle, we have that point of reference to work off of. We also have the measure of a straight line as a reference value for us. The angle measure of a straight line is one-hundred and eighty degrees. Keeping these in mind it is also very easy for us to classify angles this way. An angle that is less than a right angle is an acute angle. An angle measure that is greater than a right angle, but not quite a straight line is an obtuse angle. A straight line is considered a straight angle, which makes sense. If you ever, in your life, build anything you will need to make quick estimates on angles. Is it a right angle, is too wide or narrow of an angle. When I built my outdoor deck, I would ponder this notion every five minutes. If you think of angles as if they were hands on a clock, it makes it a good bit easier to handle.

These worksheets explain how to estimate angles using the concept of a clock face, and provide practice problems for students to demonstrate the skill. This series of worksheets will really get you going on angles. Learn how to estimate the degree of a given angle without using a protractor. Instructors may allow the use of a protractor to check answers.