South Carolina Objectives:
Investigate, identify, and create two- and three-
dimensional figures (i.e., circle, square, rectangle,
triangle, polygons, cone, cube, sphere, pyramid, prism,
cylinder) in the environment, through manipulatives, and
in pictorial representations. (3GS1-1)
Compare
and contrast plane and solid figures according to one or
more attributes (e.g., faces, edges, corners, angles,
sides, sizes, shapes). (3GS1-2)
Overview:
Students will use toothpicks and marshmallows to create
plane and solid figures. Once they have created these they
will create a chart of theses figures and label the number
of faces, edges, corners, angles, sides, and shapes. They
will then share one of their shapes and its attributes
with the class.
Focus/Essential Question: How can we make two- and
three dimensional figures? How are they alike? How are
they different?
Time Frame: Two 1 hour class periods
Resources/Materials:
1 bag of small marshmallows for every 4 students
1 box of toothpicks for every 4 students
attribute chart for each student
pencil
overhead
transparency of chart
http://www.zometool.com
Culminating Assessment: Students will fill in the
attribute chart for the shapes. Students will also discuss
one of their shapes and its characteristics with the
class. The teacher will use the following checklist:
| ____
Chart is filled out correctly |
____
Accurately described shape |
| ____
Chart is filled out completely |
____
Worked well in group |
|
4
checks = A; 3 checks = B; 2 checks = C; 1 check =
D; 0 checks = F |
Marshmallow Geometry Attribute Chart
| SHAPE |
#
Faces |
#
Edges |
#
Corners |
#
Angles |
#
Sides |
#
Shapes |
| SQUARE |
|
|
|
|
|
|
| RECTANGLE |
|
|
|
|
|
|
| TRIANGLE |
|
|
|
|
|
|
| CUBE |
|
|
|
|
|
|
| PYRAMID |
|
|
|
|
|
|
| PRISM |
|
|
|
|
|
|
How are the two-dimensional figures the same as the
3-dimensional figures?
How are the two-dimensional figures different than the
3-dimensional figures?
Instructional Activities:
Remind students what the difference is between
two-dimensional and three-dimensional figures. Discuss
this by having volunteers point out examples found in the
classroom. Tell students they are going to make both types
of figures using marshmallows and toothpicks. They will
work with a partner. As they create these figures, they
are to count the number of faces, edges, corners
(vertices), angles, sides, and shapes. Review with the
students what each of these terms means. Remind them to
use the term 'side' with two-dimensional figures and the
term 'face' with three-dimensional figures. Depending on
your class, you may want to use the term 'vertex' or
'vertices' interchangeably with 'corner'.
Pass out the chart. Tell students the blank spaces in the
SHAPE column are for them to come up with some other
two-and three-dimensional shapes to create. They are to
fill in the chart with the name of the shape as well as
filling out the appropriate column. The students should
already have a working knowledge of polygons and space
figures.
The teacher can model how to make the first shape for the
students using toothpicks and marshmallows. Once she has
created the square, discuss its attributes. Fill in the
chart that is on the overhead. As the pairs of students
work to create the shapes the teacher should monitor and
assist as needed. The students may not finish the task the
first day. Allow them to complete their shapes and the
charts the following day, if necessary.
Once the shapes and charts are completed, each pair of
students should choose one of their shapes to discuss with
the class. They will tell about its attributes and where
people can find or use these shapes. Students may correct
their chart if they find an error during this discussion.
After all the teams have had a turn, discuss any patterns
teams found. Display the shape models and the charts in
the school hall or media center.
ENRICHMENT:
Your students may enjoy going to http://www.zometool.com
for some ideas on some more shapes to make. Zometools are
educational tools you can purchase. However, you can also
get ideas from their web site on more complex shapes the
students can create with the marshmallows and toothpicks.
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