The Mathematical Modeling Handbook is intended to support the implementation of the Common Core State Standards high school Mathematics Modeling conceptual category. The CCSS document provides a brief description of mathematical modeling accompanied by 22 star symbols (*) designating modeling standards and standard clusters. The CCSS approach is to interpret modeling “not as a collection of isolated topics but in relation to other standards.”
The goal of this Handbook is to aid teachers in implementing the CCSS approach by helping students to develop a modeling disposition, that is, to encourage recognition of mathematical opportunities in everyday events. The Handbook provides lessons and teachers’ notes for thirty modeling topics together with reference to specific CCSS starred standards for which the topics may be appropriate.
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TABLE OF CONTENTS
PREFACE v
INTRODUCTION vii
Mathematical Modeling Modules
COULD KING KONG EXIST? 110
When watching the movie King Kong, moviegoers are swept away with the idea of a gigantic gorilla capable
of running around, climbing with ease, and, most importantly, saving Ann Darrow from harm. But could
this animal really exist? In this twoday lesson, students will investigate surface area, volume, and bone
strength to determine if his existence is mathematically possible.
A MODEL SOLAR SYSTEM 1120
In this twoday lesson, students will create several scale models of the Solar System using everyday items.
Open with discussing the size of the universe and aim to steer the conversation towards the size of the
astronomical bodies. Pose questions that make students think about how large one astronomical body is
compared to another. How can they create a model that considers the scale of the bodies?
FOR THE BIRDS 2128
In this twoday lesson, students are challenged to consider the different physical factors that affect realworld
models. Students are asked to find out how long it will take a birdfeeder — with a constant stream of
birds feeding at it — to empty completely.
To begin, explain that the students will be watching over a neighbor’s home. This neighbor is an ornithologist
(a scientist that studies birds) with a birdfeeder to be looked after. Humans can’t come around too often
because it will frighten the birds, but they also can’t come around too infrequently because the birds will
leave if the feeder frequently is empty. The students need to find out when to come back and fill the feeder
to ensure that the neighbor and the birds are all happy.
ON SAFARI 2938
In this twoday lesson, students determine the best way to schedule their time while out on a safari. With
only four hours to be out they must use the probabilities of seeing an animal species to determine how
much time they should spend there before moving on. The probabilities change with the amount of time
spent at a location.
By determining the expected number of animal species seen, students see that the ideal amount of time
spent at each location is neither the maximum value nor the minimum value. They justify their conclusion
about scheduling using a graph and the slopes of lines from the origin.
CHOOSING A COLLEGE 3948
In this twoday lesson, students determine their bestmatched college. They use decisionmaking strategies
based on their preferences and ranked choices. This lesson guides students through the process of selecting
a list of choices and rating these choices based on their preferences in order to find the college most
suited to their preferences and requirements.
A TOUR OF JAFFA 4958
In this twoday lesson, students will model a graph optimization problem called the “Traveling Salesman
Problem” (TSP). The TSP seeks to minimize the cost of the route a salesperson should follow to visit a set of
cities and return to home. The goal is to find a minimalcost Hamilton circuit in a complete graph having an
associated cost array, M.
To begin, explain the situation to students. They are about to visit a new place such as a zoo, a city, a shopping
center, or an amusement park, and they wish to plan their trip beforehand. What should they consider
when planning their trip? How would they plan the most efficient route?
GAUGING RAINFALL 5966
In this twoday lesson, students will estimate the average rainfall for a 16 km by 18 km territory in
Rajasthan, India. Rainfall estimations will be based on rain gauges scattered around the territory. Since
these placements are varied, students will need to identify each gauge’s “region of influence” to estimate
the average rainfall.
To begin, explain the situation that needs to be modeled. Meteorologists need to understand average rainfall
totals in a region in order to make shortterm forecasts. These are usually for relatively shorter periods
of time. Climatologists need to understand average rainfall totals for relatively longer periods of time in
order to understand, among other things, climate change.
NARROW CORRIDOR 6776
In this twoday lesson, students are asked to determine whether large, long, and bulky objects fit around
the corner of a narrow corridor.
The objective of this lesson is to apply the concept of turning points (maximum or minimum points) and
the Pythagorean Theorem to determine the longest object that can go around the corner of a corridor.
TALE OF THE TAPE 7788
In this twoday lesson, students will model the path of a baseball in flight and use that model to determine
how far the ball will travel (in ground distance). Students then use those ideas to apply them to skeet
shooting where they determine not just the flight of the clay disk, but also the flight of the pellet and their
intersection point.
Ideally, the lesson will involve solving a system of linear equations to determine the function and solving a
quadratic equation to find the roots of this function, although other models are encouraged. For some
examples, you may be able to factor to solve the resulting quadratic equation, but if the polynomial is prime,
the quadratic formula, completing the square, or the graphing calculator can be used.
UNSTABLE TABLE 89100
Have you ever tried to eat on an unstable, tippy table? No doubt drinks and soup were spilled easily!
Restaurant wait staff often fold paper napkins to wedge under one of the legs to stabilize the table.
In this twoday lesson, students learn to stabilize a table without the use of napkins — they can rotate it up
to 90°. The result is counterintuitive but can be verified mathematically.
SUNKEN TREASURE 101108
In this twoday lesson, students help the crew of a shipwreck recovery team minimize the amount of work
done to remove treasure chests from a ship lost at sea. The divers must move the chests to a rope that is
between their locations coming from the recovery team’s boat above. The captain of the boat’s crew insists
on placing the rope in one spot; he doesn’t want to waste time and money moving it each time a chest is collected.
ESTIMATING TEMPERATURES 109116
In this twoday lesson, students will model temperature data. They will use “known temperature stations”
in order to estimate temperatures at any given point accurately. Websites that give the temperature at a
specific place typically do not give the actual values; they give an estimate based on meteorological data.
Explain to students that temperatures are not measured everywhere and educated estimates need to be
made. Have the students imagine they are meteorologists interested in making a model to estimate temperature
at a given time and at a given location.
BENDING STEEL 117124
Metal railroad tracks expand and contract due to weather. In this twoday lesson, using the assumption that
a railroad track is secured at both ends, students will use models to estimate how expansion of the track
affects the height of the rail off the ground. Sometimes tracks will expand outward along the ground, but
this lesson focuses on the case where they expand upward.
Interestingly, very small increases in length as a result of expansion have a large effect on height. Students
will investigate this phenomenon using both triangular and arc models.
A BIT OF INFORMATION 125134
In this twoday lesson, students will learn to use a logarithmic function to model information functions. A
significant portion of the secondary curriculum revolves around the analysis of functional relationships. In
the context of computers, the notion of sending and receiving information gives way to an interesting relationship
between the required length of code and how much information it carries.
In fact, this represents one of very few real world situations where only a logarithmic function can model
the relationship.
STATE APPORTIONMENT 135142
A new country is being formed in this twoday lesson. Students will determine how to allot the representation
for the different states in the country, also known as apportionment.
Begin by asking students how democracy works in the US Ask them how a country that is newly forming
and wishes to adopt a similar representation system to the US might pick how many representatives each
state gets. What different mathematical ways are there to model this?
RATING SYSTEMS 143150
In this twoday lesson, students will model rating systems like those used in many sports. They are asked to
consider the various factors that the human mind employs to “rate” one team over another; they will then
model a way to consider these factors in order to make a systematic, mathematical rating method. Note that
even professional rating systems often are disputed for their “accuracy”: such is the nature of both mathematical
modeling and sports!
Begin with the description of the situation: you are trying to compare teams or players, but not every
team/player plays the other, so there is no clear “cleancut” method. How can you devise a system to do
this?
THE WHE TO PLAY 151158
In this twoday lesson, students develop different strategies to play a game in order to win. In particular,
they will develop a mathematical formula to calculate potential profits at strategic points in the game and
revise strategies based on their predictions.
Allow students to imagine that they are living in the twin islands of Trinidad and Tobago where a popular
game called Play Whe is played everyday. They can think of the game as an investment opportunity and
their goal is always to realize a profit. How can they devise a strategy so that their expenditure is always
less than their potential winnings?
WATER DOWN THE DRAIN 159168
In this twoday lesson, students will collect data from a water dripping experiment. The data that the students
collect will be the basis for estimating how much water is wasted from typical leaky faucets. At the
beginning of the lesson, the students are faced with a statistic that states leaky faucets in US homes waste
$10,000,000 worth of water each year. At the end of the lesson, students will have the opportunity to determine
what specifications (homes, faucets, drips/minute) result in that amount of money.
VIRAL MARKETING 169176
In this twoday lesson, students will model “viral marketing.” Viral marketing refers to a marketing strategy
in which people pass on a message (such as an advertisement) to others, much like diseases and viruses are
spread.
To begin, explain that you are interested in starting your own business and you are researching different
marketing strategies to “get the word out.” Viral marketing is one strategy that should be considered. What
is viral marketing and what can be said about it mathematically?
SUNRISE, SUNSET 177184
In this twoday lesson, students will examine changes in the average monthly sunlight over the course of a
year. They will use actual sunrise and sunset data found on the internet in order to calculate the “length of
an average day” for the chosen city. Students will model the data with a sine curve. The model will be interpreted
and used to make connections to the real world.
SURVEYING THE ANCIENT WORLD 185194
In this twoday lesson, students will construct and use a simple version of an ancient tool called an
astrolabe. This tool measures the angle between the tool and the horizontal plane. It was used frequently
by ancient surveyors, engineers, astronomers, and seafarers to compute angles and heights.
To introduce the lesson, explain the use of the astrolabe to students and have them imagine that they are
ancient surveyors trying to measure the heights of mountains. The astrolabe only measures angles, though.
How could ancient surveyors complete their task?
PACKERS' PUZZLE 195204
In this twoday lesson, students consider ways to estimate the number of spheres that will fit within a container.
They also will try to pack as many as possible into differently shaped containers.
The objective of this lesson is to have students use geometric solids so that they can solve basic packing
problems that arise in the real world.
FLIPPING FOR A GRADE 205214
In this twoday lesson, students play different coinflipping games and try to understand what the outcomes
may be. The objective of this lesson is to understand the meaning of expected value and standard
deviation and why they are so important.
PRESCIENT GRADING 215226
In this twoday lesson, students will learn how to approximate test grades given homework grades. They
will construct a scatter plot and use the line of best fit to predict grades, as well as examine the effect the
correlation coefficient and the residual have on the predictions.
PICKING A PAINTING 227234
In this twoday lesson, students are asked to choose the best possible painting from a group provided to
them. Certain restrictions prevent students from going back to previously viewed paintings, so choosing the
best is not as straightforward as just looking at all of them and deciding.
The objective of this lesson is to use ordering and logical thinking to create probabilistic strategies that have
greater chances of success than just random selection. Conditional probability is also explored as a way to
evaluate the strategies further.
CHANGING IT UP 235242
In this twoday lesson, students will examine the United States monetary system and make mathematical
judgments about how to stock a cash register till (the drawer containing the money that “pops out” of the
register). Different situations are modeled, each time refining the initial model.
Introduce the students to the situation to be modeled: a cash register till needs to be stocked with extra
coin rolls. Cashiers want to try to run out of all the types of change at about the same time so they need to
cash in for new change as rarely as possible. Understocking doesn’t work because running out of coins too
frequently results in longer waiting times for customers, and supervisors have to supply more change for
the cashier. The till cannot be overstocked with coin rolls because it will be too heavy and will be very slow
to open.
INDEX 243
