1. science
2. mathematics
3. arithmetic

Pampered
Pets
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Some animals
have a furry and
fabulous life!
P
icture this: You travel
to England to enjoy
surfing lessons, a
new wardrobe, and
food cooked by a personal chef.
This vacation is available
through a website called
VeryFirstTo.com for $73,000.
Here’s the catch: It’s for dogs.
Around the world, people
are dropping big bucks on
everything from a $430,000
doghouse to a $4.2 million
tiara for their animal
companions. Americans are
no exception. Last year, we
spent $55.7 billion on our pets.
This year, we’re expected to
spend $58.5 billion.
“As people have made pets
a significant part of the family,
they’re willing to spend more
money on them. They’re
treating them in ways that are
meaningful, as if they were
taking care of a person,” says
Bob Vetere. He’s the president
of the American Pet Products
Association.
The rise in pet spending
isn’t only because of luxury pet
products. Many companies
are getting in on the petspending boom by offering
everyday goodies.
1
Tiaras and swanky beds, fancy
doghouses, and cutesy costumes
are just a few ways people dote
on their pets.
BarkBox, for example, ships
packages full of treats and toys
to its dog-loving customers
once a month. A product
called the Whistle activity
monitor attaches to a dog’s
collar and tracks its location
and activity level. And with
DogVacay, owners can find a
safe place for their dogs to stay
while they’re on vacation.
It’s no surprise that many pet
owners consider the billions
spent on their pets to be money
well spent. According to Vetere,
studies show that pets can help
improve our health and
emotional well-being. In other
words, what pets give back to
their owners can be priceless.
—Courteney
Palis
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Rounding
C. Based on your answer in
part B, what is the price rounded
to the nearest whole number?
B. Let’s say that one not-sothrifty pet owner decides to get
one carrier for each of her 4
dogs. Based on your answer
from part A, about how much
would 4 dog carriers cost?
3
5
Solve the following problems using rounding to learn
more about the costs of pet products and services.
1
One box of the flea
treatment “Bug Free’s the
Way to Be” costs $49.
A. Between which two tens
does this price fall?
B. On the number line, mark
JOHN LUND/BLEND IMAGES/CORBIS (CAT); LA PETITE MAISON (DOGHOUSE); LABAT-ROUQUETTE/KIMBALL STOCK (TERRIER); PACIFICCOASTNEWS/NEWSCOM (CARRIER).
the two tens, the halfway point
between them, and the price.
Is the price greater than or
less than the halfway point?
C. Based on your answer
Using a pet-sitting service
called Rover, a New York
City dog owner found a dog
sitter who charges $37 per day.
A. On the number line,
mark the two tens that this
cost falls between. Mark the
halfway point and the price.
What’s the price rounded to
the nearest ten?
Petnet’s SmartFeeder is
a device that allows pet
owners to feed their pets from
a laptop, tablet, or smartphone.
Each feeder costs $249.
A. On the number line, mark
the two hundreds that this
cost falls between. Mark the
halfway point and the price.
What is the price rounded to
the nearest hundred?
in part B, what is the price
rounded to the nearest ten?
2
A cat hammock called
the Kittywalk Kabana
costs $102.95 at an online
pet store.
A. Between which two whole
numbers does this price fall?
B. On the number line, mark
the two whole numbers, the
halfway point between them,
and the price. Is the price
greater than or less than the
halfway point?
B. Based on your answer from
part A, about how much would
dog-sitting cost for 5 nights?
4
A designer dog carrier
made by Louis Vuitton
costs $2,940!
A. On the number line, mark
the two hundreds that this
cost falls between. Mark the
halfway point and the price.
What’s the price rounded to
the nearest hundred?
B. Based on your answer from
part A, about how much would
3 of these feeders cost? By
how much does your estimate
differ from the actual cost?
C. Would your estimate have
been more accurate if you
rounded to a different place value
in part A? If yes, which one?
Louis Vuitton
dog carrier
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2
LESSON PLANS
page 1 Rounding
Pampered Pets
Content Standard
Number and Operations in Base 10:
Use place value understanding to round whole
numbers to the nearest 10, 100, and 1,000
Mathematical Practices Standards
1. Make sense of problems and persevere
in solving them
5. Use appropriate tools strategically
8. Look for and express regularity in repeated
reasoning
OBJECTIVE
Students will assess the reasonableness
of answers using mental computation and
estimation strategies including rounding.
LESSON
Engagement
1. First, have students read the article. To facilitate discussion, ask students:
•Do you have a pet that you pamper? Would
you ever buy your pet a $4.3 million dollar
tiara? Do you have an opinion on how much is
appropriate to spend on a pet?
Concept Development
2. Begin building conceptual understanding by
asking students to explain what rounding is.
•Ask: What does it mean to round a number?
Possible answer: Rounding is a way of
adjusting numbers so they are simpler
and easier to work with.
•The number line is a powerful tool for
providing conceptual understanding so
students know what they’re actually doing
when rounding. We can use it to help them see
why rounding gives us a particular number at
a given place value.
•Write the number 348 on the board and tell
students that we’re going to round this number
using number lines. On the board, draw a
number line with an arrow at both ends. Divide
the number line into 10 equal parts.
•Ask: Which numbers do we place at the ends?
Answer: It depends on which place value I am
rounding to.
•What number goes in the middle of the number
line? Discuss with your partner. Answers:
half-way point, the middle value, the number
between the end numbers
•Round this number, 348, to the nearest tens
place, hundreds place, and thousands place
using 3 different number lines. Have students
complete each number line up and then
compare with examples below. .
Number lines for rounding 348 . . .
to the nearest ten
340
to the
nearest
hundred
348
345
400
350
350
to the nearest thousand
348
348
0
500
1,000
300
Answers: Rounding to the tens: 340, rounding to
the hundreds: 300, rounding to the thousands: 0.
Application
3. Have students complete problems 1 through
5. You can use a whiteboard to draw the number
lines if you prefer. Students can discuss their
responses with a partner if time allows.
Closure
4. Give students the opportunity to round smaller
and larger numbers using a number line. The
“Rounding on a Number Line” skills sheet will
provide more practice (see below.)
Concept Reinforcement Online
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Click on the “Skills Sheet” button in
your digital issue for the “Rounding
on a Number Line” skills sheet.
Students will practice rounding
to various place values. (Also
availableattached below.)
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NAME
_______________________________
Rounding on a Number Line
In “Pampered Pets” (pages 1-2), you used rounding to estimate the costs of pet products and services.
A number line is a great tool to see why numbers round up or down, depending on the place value you’re
rounding them to. In the problems below, round each amount to the place value specified. Draw a number line
to show your thinking.
Round the weight of each item to the
nearest 10 ounces.
52 ounces
3
Mario rounds 804 to the nearest 10. He
says the answer is 810. Explain whether
his answer is correct.
4
Round the following capacities to the
nearest 100.
386 milliliters
16 ounces
1,312 gallons
127 ounces
2a
Francie’s track meet begins at 10:30
and ends at 12:43. How long will the
track meet be, in minutes?
523 liters
5
468
2b
Circle the numbers that round to 500
when rounded to the nearest hundred.
432
520
591
449
What is this amount rounded to the
nearest 10?
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549
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