Paper Protractor
Grade Level(s): 4th
Grade
Content Area: Process Area:
Numbers and
Operations Problem-Solving
Algebra Reasoning
and Proof
Geometry Communication
Measurement Representation
Data Analysis,
Statistics, and Probability Connections
Common Core Standards:
CCSS.MATH.CONTENT.4.MD.C.6: Measure angles in
whole-number degrees using a protractor. Sketch angles of specified measure.
CCSS.MATH.CONTENT.4.MD.C.7: Recognize angle measure as
additive. When an angle is decomposed into non-overlapping parts, the angle
measure of the whole is the sum of the angle measures of the parts. Solve
addition and subtraction problems to find unknown angles on a diagram in real
world and mathematical problems, e.g., by using an equation with a symbol for
the unknown angle measure.
Targeted Needs of Student:
Recognizing
the connections of many different angles, using something other than a basic
protractor to find the degrees of an angle, using a triangle to explain degrees
of angles, proving why these angles work through understanding of angle
relationships
Goal:
Building
student understanding of relationships between angles using another version of
a protractor
Materials Needed:
- Square piece of paper
- Protractor
- Hard edge (maybe a ruler)
- Marker
Explanation/Summary:
Students will make
a paper protractor by following the steps of making this protractor on the
website listed below. When doing this, students will make a series of folds
that represent certain angles including 15, 30, 60, 75, and 90 degrees. This
can be used as a reference for finding angles or for proving why these angles
work with the other angles to build understanding of angle relationships.
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