Math Concept Reader MCR g3 party plans by the numbers!

Math Concept Reader
Party Plans by
the Numbers!
ca32os_lay_070109af_ll.indd 1 1/9/07 1:10:42 AM
DIGITAL FINAL PROOF
Math Concept Reader
Party Plans by
the Numbers!
ca32os_lay_070109af_ll.indd 2 1/9/07 1:10:46 AM
DIGITAL FINAL PROOF
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ISBN 13: 978-0-15-360180-4
ISBN 10: 0-15-360180-9
1 2 3 4 5 6 7 8 9 10 179 16 15 14 13 12 11 10 09 08 07
by Linda Bussell
Math Concept Reader
Party Plans by

the Numbers!
ca32os_lay_070109af_ll.indd 3 1/9/07 1:10:48 AM
DIGITAL FINAL PROOF
The students in the chorus club are excited.
Their teachers, Mr. Sanchez and Miss Anderson,
just told them good news. They are having a party
to celebrate winning the choir competition. Mr.
Sanchez says that students will plan the party.
Parents will help.
Miss Anderson asks the students what kind
of party they want. The students discuss some
dif
fer
ent ideas. They choose to have a picnic at a
park. They will decorate and have food. They will
have games, too. It will be fun.
2
Chapter 1:
Sandwich
Multiplication
ca32os_lay_070109af_ll.indd 2 1/9/07 1:10:55 AM
DIGITAL FINAL PROOF
Mr. Sanchez asks for helpers to plan the food
and games for the party. Some helpers will make
decorations. Others will work at the party. The
workers will help serve food and drinks. Some
students will help clean up after the party
.
Mr
. Sanchez wants students to sign up to help. He

puts a sheet of paper on a table. Many students sign
up. Six sign up to help with food.
Miss Anderson says to plan for 36 people at the
Party
. Ther
e will be 30 students and 6 adults.
3
Students will decorate for the party.
ca32os_lay_070109af_ll.indd 3 1/9/07 1:11:00 AM
DIGITAL FINAL PROOF
Mike and Kayla will help with the food. They
decide to make sandwiches because most people like
them. Mike’s favorite sandwich is turkey on a bun.
Kayla’
s favorite sandwich is cheese on bread. They
decide to make those two kinds of sandwiches. How
many of each do they need?
T
o find out, they ask for a vote. Each student in the
30-member club votes. Including Mike, 20 students
want turkey on a bun. The r
est, including Kayla, want
cheese on br
ead.
4
Students vote for the kind of sandwich they want to eat.
ca32os_lay_070109af_ll.indd 4 1/9/07 1:11:12 AM
DIGITAL FINAL PROOF
Kayla subtracts.
30 – 20 = 10

There ar
e 30 students in the club. Kayla knows that
20 students want turkey on buns. She figures out that
10 students want cheese on bread. She says that two
times as many students want turkey as cheese. Mr.
Sanchez says to plan the same for adults. He thinks
twice as many adults will also want turkey sandwiches
as cheese.
Ther
e ar
e 6 adults. There should be 4 turkey
sandwiches and 2 cheese sandwiches for them.
Now Kayla and Mike can make a shopping list.
5
Sandwiches
Turkey Cheese
Students 20 10
Adults 4 2
Total 24 12
ca32os_lay_070109af_ll.indd 5 1/9/07 1:11:22 AM
DIGITAL FINAL PROOF
Kayla and Mike ask Mike’s mom to help them
figure out how much food to buy. They need enough
food to make 24 turkey sandwiches and 12 cheese
sandwiches.
First, they figur
e out how much turkey they will
need. Mike’
s mom will buy turkey in packs of 10
servings. Three packs are enough for 24 sandwiches.

They will have 6 servings left over.
If they find packs with 8 servings, they will still need
3 packs. There will be no turkey left over. If they find
packs of 12 servings, they will need only 2 packs.
6
3 packages of 10 servings 3 x 10 = 30 6 left over
3 packages of 8 servings 3 x 8 = 24 0 left over
2 packages of 12 servings 2 x 12 = 24 0 left over
ca32os_lay_070109af_ll.indd 6 1/9/07 1:11:33 AM
DIGITAL FINAL PROOF
Kayla and Mike need to buy buns for the turkey
sandwiches. Buns are often sold in packs of 8.
Mike’s mom says they will need 3 packs to make 24
sandwiches. If they find buns in packs of 12, they will
need only 2 packs.
Now they know how much food to buy to make
24 turkey sandwiches. Mike adds this information to
a shopping list. He does not want to for
get anything
when they get to the stor
e.
Next, Mike and Kayla decide how much bread and
cheese to buy.
7
Needed to Make 24 Turkey Sandwiches
Turkey
3 packages of 10 servings 3 x 10 = 30 6 left over
3 packages of 8 servings 3 x 8 = 24 0 left over
2 packages of 12 servings 2 x 12 = 24 0 left over
Buns

3 pa
ckages of 8 servings 3 x 8 = 24 0 left over
2 packages of 12 servings 2 x 12 = 24 0 left over
ca32os_lay_070109af_ll.indd 7 1/9/07 1:11:44 AM
DIGITAL FINAL PROOF
Mike and Kayla need 12 cheese sandwiches.
How many slices of cheese should they put on each
sandwich? Mike says he puts 2 slices of cheese on a
sandwich. They will need 24 slices of cheese.
12 x 2 = 24
Cheese comes in packs of 10 slices. They will need 3
packs. Thr
ee packs have 30 slices in all.
3 x 10 = 30
Ther
e will be 6 cheese slices left over.
30 – 24 = 6
8
Mike’s mom makes sandwiches for a snack.
ca32os_lay_070109af_ll.indd 8 1/9/07 1:11:52 AM
DIGITAL FINAL PROOF
Bread:
2 loaves of 15 slices
15 + 15 = 30 6 left over
Cheese:
3 packages of 10 servings
3 x 10 = 30 6 left over
Kayla and Mike
are hungry. Mike’s
mom makes them

sandwiches.
Kayla r
eads the
br
ead label and learns
that there are 15 slices
in a loaf. They will need
2 loaves. Ther
e will be 6
slices of br
ead left over.
They will have
enough food to
make 3 mor
e cheese
sandwiches. Mike says
this is okay because
some people might
eat mor
e than one
sandwich.
Mike finishes the
shopping list and puts it
in his pocket. They ar
e
r
eady to go to the store
to buy the groceries.
9
Shopping List

Turkey:
2 packages of 12 servings
(24 servings)
Or 3 packages of 8 servings
(24 servings)
Or 3 packages of 10 servings
(30 servings)
Buns:
2 packages of 12 servings
(24 servings)
Or 3 packages 8 servings
(24 servings)
Cheese:
3 packages of cheese (30 slices)
Bread:
2 loaves of bread (30 slices)
ca32os_lay_070109af_ll.indd 9 1/9/07 1:12:05 AM
DIGITAL FINAL PROOF
10
Maria and Claire help with food for the picnic, too.
They want to make a salad. Maria says her family
has a recipe for good fruit salad and that everyone
loves it. They always pr
epare it for family gatherings.
Her dad will help make the salad because it requires
slicing lots of fruit.
Maria and Clair
e go to the kitchen to find the
r
ecipe for the fruit salad. It has strawberries,

bananas, oranges, apples, and grapes in it. Claire
says the salad sounds good, and she thinks everyone
at the picnic will enjoy it.
10
Chapter 2:
Salad and
Drinks
ca32os_lay_070109af_ll.indd 10 1/9/07 1:12:11 AM
DIGITAL FINAL PROOF
Shopping List
9 apples
9 bananas
9 oranges
54 strawberries
72 grapes
Fruit Salad (4 servings)
1 apple 6 strawberries
1 banana 8 grapes
1 orange
Wash fruit.
Have an adult slice the banana,
apple, orange, and strawberries.
Place in bowl. Add grapes. Mix
with spoon. Chill.
Claire and Maria need 36 servings of salad for
the party, but Maria’s recipe makes only 4 servings.
Maria wonders how to make enough fruit salad for 36
people.
9 x 4 = 36
Clair

e says they must multiply everything in the
r
ecipe by 9, and then they will have enough fruit salad.
Claire and Maria read the recipe together and
multiply each ingredient by 9. Claire makes a shopping
list. She lists each item they need and how much of it
they need. Maria’
s dad will take them to the stor
e.
11
Claire and Maria use the recipe
to make a shopping list.
ca32os_lay_070109af_ll.indd 11 1/9/07 1:12:16 AM
DIGITAL FINAL PROOF
Jacob and Carlos help plan the party. They are in
charge of drinks. They discuss how many to buy.
Jacob says they should buy 2 drinks for each
person. The weather will be hot. People will play
games, and everyone will be thirsty
. One drink each
might not be enough.
Carlos thinks they should buy water and maybe
juice, too. That way
, people will have a choice of
what to drink. Carlos and Jacob decide to buy juice
and water
. They will buy extra water to make sur
e
they do not run out of drinks.
12

Carlos thinks they should have plenty of
water for everyone.
ca32os_lay_070109af_ll.indd 12 1/9/07 1:12:21 AM
DIGITAL FINAL PROOF
Shopping List
6 six-packs of juice
(36 servings)
2 cases of water
(48 servings)
Jacob and Carlos go to the store. The store sells
six-packs of juice. They buy 6 six-packs.
6 x 6 = 36
The stor
e sells cases of water
. There are 24 bottles
in a case. They buy 2 cases.
24 + 24 = 48
Carlos says 2 cases will give them 12 extra
bottles of water
. It will be good to have extra in case
someone is very thirsty
.
48 – 36 = 12
That will be enough to drink.
Now the food for the picnic is planned. They will
serve sandwiches, salad, and drinks.
13
ca32os_lay_070109af_ll.indd 13 1/9/07 1:12:27 AM
DIGITAL FINAL PROOF
Chapter 3:

Party Day!
The day of the picnic has arrived! Everyone in the
chorus club worked hard to plan and prepare. The
decoration team painted bright banners and hung
them up. They decorated the tables, too. The game
team planned many games. One game even uses
water balloons!
The weather is perfect. It is sunny and warm.
Everyone enjoys the games. They play very har
d.
Soon they ar
e thirsty. Jacob and Carlos offer water
from a cooler full of ice.
At last, it is time to eat.
14
ca32os_lay_070109af_ll.indd 14 1/9/07 1:12:32 AM
DIGITAL FINAL PROOF
Kayla and Mike help the parents serve turkey and
cheese sandwiches. Claire and Maria scoop colorful
fruit salad onto plates. Jacob and Carlos hand out
cold juice and water
.
Everyone talks and laughs. Ther
e is plenty to eat.
They all have a great time.
Now it is time to clean up. Mr. Sanchez thanks
the teams for their help. Miss Anderson says that
their planning made the picnic fun. The students
smile. They ar
e the perfect party planners! The

picnic was a gr
eat way to celebrate winning the choir
competition.
15
Everything is ready for the picnic.
ca32os_lay_070109af_ll.indd 15 1/9/07 1:12:37 AM
DIGITAL FINAL PROOF
16
Glossary
= (equal sign) a symbol used to show that two
numbers have the same value
Example: 12 = 12
x (multiplication sign) a symbol placed
betw
een tw
o numbers to show that the first
number is to be multiplied by the second number
Example: 2 x 3 = 6
case a container of like things packaged
together
,
such as a case of water bottles
loaf bread or other food that is baked in one
piece and then sliced into sm
aller pieces
m
ultiply when you combine equal groups, you
can multiply to find how many in all
serving an amount of food for one person
Photo Credits: cover, title page, p. 4: © Michael Newman/Photo Edit; pp. 3, 5,

6, 7, 9, 11, 13, 15: Russell Pickering; p. 8: © Corbis; p. 12: © Bill Aron/Photo Edit
ca32os_lay_070109af_ll.indd 16 1/9/07 1:12:37 AM
DIGITAL FINAL PROOF
Think and Respond
1. One type of chicken comes in a package
that has 6 servings. How many servings are in 5
packages?
2. One apple can be cut into 4 slices. How many

slices can be m
ade from 7 apples?
3. Look at the recipe on page 11. Suppose
Maria wanted to serve 8 people instead of 4.
How would the recipe need to change in
order to serve 8 people?
4. At the store, suppose this was the only way

to buy tur
key.

2 pac
kages of 8 servings

2 packages of 10 servings

Which packages would you buy to make 24
turkey sandwiches with as little turkey left over
as possible? Explain.
ca32os_lay_070109af_ll.indd 17 1/9/07 1:12:38 AM
DIGITAL FINAL PROOF