Baseball
Proportion: Teacher Notes
MA.7.A.1.6
Conceptual Understanding
Proportional Reasoning
Scale Factor
Similarity
Procedural Knowledge
Solve Proportions
Problem Solving
Reasoning
Communication
Connections
Representation
Have one student model
a batting stance with a regulation size baseball bat. Have another
student model the batting stance with a souvenir miniature baseball
bat. Ask the class, "Why does the student with the souvenir bat
look so funny?"
Students work in individually
or in pairs
 1 regulationsized baseball
bat
 1 souvenir miniature baseball
bat
 1 piece of posterboard
for each student
 1 metric measuring tape
for each student
 Measure the length of
the regular bat in centimeters.
 Measure the length of
the souvenir bat in centimeters.
 Measure the height of
the student holding the regular bat.
 Determine how tall a person
should be in order to be proportional to the souvenir bat.
 Using the posterboard,
draw a person the correct height.
 Have students show their
work and/or explain in words the process for determining the correct
height of the figure on the posterboard.
As a result of this activity,
students learn to use ratios and proportions to solve real world problems
involving models and drawings.
Rubric (4 points):
 Assignment is completed
on time.
 Figure’s height
measures within 0.5 cm of the correct height.
 Written explanation
shows good thinking and calculations are correct.
 Poster board figure
is neat and creative in design.
