![]() Align the straight edge of the protractor along the bottom of the angle. Draw an angle on an overhead transparency or the board. The protractor is clear so that the angle can be seen and measured accurately.The lower scale measures angles with openings on the right.The upper scale measures angles with openings on the left.The lower scale starts with 180 on the left side and decreases to 0 on the right.The upper scale starts with 0 on the left side and increases to 180 on the right.There are two rows or scales of numbers.It is shaped like a semi circle (although some protractors can be a full circle).Create a class list of observations by allowing each group to share 1 or 2 observations. Instruct students to make a list of observations based on the physical appearance of the protractor. Next, pair students together and provide each group with a protractor.Ask the students if they have seen or used a protractor before. Explain that a protractor is a tool used to measure angles. To help complete the scenario, ask students to define a protractor.RG and Hannie are not familiar with a protractor.Ĭan you help RG and Hannie solve some problems using a protractor? ![]() They are setting up a new sales display that includes several different math tools which includes rulers and protractors. RG and Hannie are working at the Raymond Geddes Elementary School Store.
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