# materials Teaching the Lesson

```Objective
To review estimation, dollars-and-cents notation, and
names for a dollar, a dime, and a penny.
1
materials
Teaching the Lesson
Key Activities
Children use estimation to identify two grocery items that could be bought for \$2.00. They
review decimal notation for dollars-and-cents amounts and identify various names for dollars,
dimes, and pennies. They investigate pennies and dimes as fractional parts of a dollar.
Key Concepts and Skills
• Read and write money amounts in dollars-and-cents notation.
[Number and Numeration Goal 2]
• Find fractional parts of \$1.00.
[Number and Numeration Goal 3]
• Estimate the total cost.
[Operations and Computation Goal 3]
• Match equivalent monetary names.
ⵧ Math Journal 2, p. 230
ⵧ My Reference Book, p. 90
ⵧ Teaching Masters (Math Masters,
pp. 296 and 297)
ⵧ Teaching Aid Master (Math
Masters, p. 415)
ⵧ Transparency (Math Masters,
p. 441; optional)
ⵧ 100 pennies, 10 dimes, and
one \$1 bill
ⵧ scissors
䉬
ⵧ paste, glue, or tape
[Measurement and Reference Frames Goal 4]
Key Vocabulary
decimal point
Ongoing Assessment: Recognizing Student Achievement Use the Math Message.
[Operations and Computation Goal 3]
2
materials
Ongoing Learning & Practice
Children practice adding whole-dollar amounts by calculating word values.
Children practice and maintain skills through Math Boxes and Home Link activities.
3
materials
Differentiation Options
Children use a 100-grid to
review the relationships
among pennies, dimes,
and dollars.
EXTRA PRACTICE
Children identify coin
combinations equivalent
to \$1.00.
ⵧ Math Journal 2, pp. 232 and 233
ⵧ Home Link Master (Math Masters,
p. 298)
ELL SUPPORT
Children add dollar-andcents notation to their Math
Word Banks.
ⵧ Teaching Master (Math Masters,
p. 299)
ⵧ Minute Math®+, p. 64
ⵧ Differentiation Handbook
ⵧ 100 pennies and 10 dimes
Advance Preparation For the optional Readiness activity, make two copies of Math Masters,
page 299 and paste or tape them together to make a 10 10 grid.
Technology
Assessment Management System
Math Message
See the iTLG.
Lesson 10 2
䉬
731
Getting Started

Mental Math and Reflexes
Math Message
Suggestions:
Look at journal page 230. Use an Exit Slip (Math
Masters, page 415). List two items you could buy
with \$2.00.
How many pennies are in a nickel? 5 What fraction of a
1
nickel is 1 penny? 5
䉬
How many dimes are in a dollar? 10 What fraction of a dollar
1
is 1 dime? 1
0
How many nickels are in a quarter? 5 What fraction of a
item and its cost. Have the class suggest combinations
of coins and dollar bills to pay for the item.
1
quarter is 1 nickel? 5
1 Teaching the Lesson
䉴 Math Message Follow-Up
WHOLE-CLASS
ACTIVITY
(Math Journal 2, p. 230; Math Masters, p. 441)
Math Message
Ongoing Assessment:
Recognizing Student Achievement

Use the Math Message to assess children’s ability to estimate the combined
value of two items. Children are making adequate progress if they successfully
complete the Math Message. Some children may be able to list three items you
[Operations and Computation Goal 3]
Student Page
Date
Time
LESSON
10 1
䉬
Fruit/Vegetables Group
Carrots
Seedless Grapes
Pork & Beans
1-lb bag
99¢ lb
Oranges
\$1.49 lb
Bananas
59¢ lb
Peanut Butter
16 oz
3/\$1.00
Plums
69¢ lb
Meat Group
18-oz jar
2/89¢
\$1.29
Chunk Light
Ground Beef
\$1.99 lb
Tuna
6.5 oz
Lunch Meat
\$1.39
Celery
Grain Group
Gallon
Milk
\$2.39
American
Cheese
8 oz
6-pack
Yogurt
\$2.09
\$1.49
Miscellaneous Items
16 oz
99¢
Saltines
1 lb
69¢
Hamburger Buns
Mayonnaise
16 oz
32 oz
69¢
\$1.99
Catsup
32 oz
\$1.09
Grape Jelly
2-lb jar
\$1.69
Math Journal 2, p. 230
732
䉯 1 pound of saltines and one 1-pound package of lunch meat no
䉯 1 pound of ground beef and one 16-ounce package of
hamburger buns no
59¢ lb
䉯 1 loaf of wheat bread and 1 pound of grapes yes
1-lb package
69¢
Milk Group
Watermelons
\$2.99 ea.
You may want to display an overhead transparency of the Good
they know that \$2.00 would be enough to buy both items. Some
will have found exact answers and some will have estimated.
Briefly discuss why estimation is appropriate, but don’t try to
teach any particular method. (In Lesson 10-5, children will learn
to estimate by rounding to the nearest 10¢.) Continue by asking
children whether \$2.00 is enough for the following:
Unit 10 Decimals and Place Value
there is none. Tell children that finding sales tax involves percent,
which they will study at a later time.
䉴 Reviewing Decimal Notation
WHOLE-CLASS
ACTIVITY
for Money
(My Reference Book, p. 90)
Write an amount like \$12.37 on the board and label it accordingly
with “whole dollar amount,” “decimal point,” and “cents amount.”
Remind children that the period after the 12 is called the decimal
point. The digits before the decimal point stand for whole dollar
amounts; the digits after the decimal point stand for cents
amounts (less than a dollar). Point out that in dollars-and-cents
notation, there are always two digits after the decimal point.
NOTE Although amounts of 1 dollar or more
can be written as cents (\$1.25 125¢), this
isn’t usually done.
Ask someone to read the amount shown on the board. Write the
answers on the board to support English language learners.
Sample answers: twelve dollars and thirty-seven cents; twelve
dollars thirty-seven cents; twelve dollars thirty-seven; twelve
thirty-seven The “and” in “twelve dollars and thirty-seven cents”
stands for the decimal point.
With children, practice reading and writing money amounts in
dollars-and-cents notation. Suggestions:
䉯 Write amounts such as \$1.25 and \$3.05 on the board. Ask
children to read the amounts. One dollar and twenty-five cents;
three dollars and five cents
䉯 Ask: In \$1.25, what does the 1 stand for? 1 dollar What does the
25 stand for? 25 cents
䉯 Write amounts less than one dollar, such as \$0.48 and \$0.06.
and 48 cents,” but it is usually read simply as “48 cents.”
䉯 Dictate amounts such as “5 dollars and 64 cents,” “32 cents,”
and “3 cents.” Children write them in dollars-and-cents
notation on their slates.
This is a beginning exposure to decimal
numbers with manipulatives to the
hundredths is a Grade 3 Goal.
your class in My Reference Book, page 90.
䉴 Investigating Pennies and
WHOLE-CLASS
ACTIVITY
Dimes as Fractions of a Dollar
Use pennies, dimes, and dollars to illustrate the relationships
among these coins and \$1.00. Record the relationships on the
board (see margin). Ask questions like the following:
●
How many pennies are in one dollar? 100 pennies
●
What part of a dollar is a penny? 100 of a dollar
●
How do you write 1 penny in dollars-and-cents notation? \$0.01
1
Or like these:
●
How many dimes are in one dollar? 10 dimes
●
What part of a dollar is a dime? 10 of a dollar
●
How do you write 1 dime in dollars-and-cents notation? \$0.10
penny
1¢
\$0.01
dime
10¢
\$0.10
1
100
10
100
1
10
of a dollar
of a dollar
of a dollar
1
Lesson 10 2
䉬
733
Teaching Master
Name
Date
Time
LESSON
10 2 Many-Name Scramble
䉬
Cut out the names of
,
, and
from Math Masters,
page 297. Then paste them in the proper columns below.
\$1.00
one-tenth
of a dollar
a dollar
10¢
10 dimes
a dime
one-hundredth
of a dollar
100 pennies
\$0.10
1¢
\$0.01
1
100
of a dollar
1
10
䉴 Matching a Dollar, a Dime,
INDEPENDENT
ACTIVITY
and a Penny with Their Names
(Math Masters, pp. 296 and 297)
Children cut out the names from Math Masters, page 297 and
paste them in the proper columns on Math Masters, page 296.
This is an early exposure to identifying the whole unit given a fractional part of a
region or a collection. This skill is addressed throughout third grade and is a
a penny
of a dollar
2 Ongoing Learning & Practice
Math Masters, p. 296
䉴 Calculating Word Values
INDEPENDENT
ACTIVITY
(Math Journal 2, p. 232)
Children pretend that the letters of the alphabet have been
assigned the dollar values shown at the top of the journal page.
They calculate the values of words. For example:
䉯 What is the value of cat?
\$3 \$1 \$20 \$24
䉯 What is the value of dog?
\$4 \$15 \$7 \$26
Teaching Master
Name
LESSON
10 2
䉬
Date
Time
Many-Name Scramble
continued
1
100
of a dollar
\$1.00
\$0.01
100 pennies
a dollar
10 dimes
one-tenth of
a dollar
1
10
of a dollar
10¢
one-hundredth
of a dollar
a dime
1¢
\$0.10
a penny
Math Masters, p. 297
734
Unit 10 Decimals and Place Value
䉴 Math Boxes 10 2
䉬
INDEPENDENT
ACTIVITY
(Math Journal 2, p. 233)
Mixed Practice Math Boxes in this lesson are paired with
Math Boxes in Lesson 10-4. The skill in Problem 6
previews Unit 11 content.
Student Page
INDEPENDENT
ACTIVITY
䉬
(Math Masters, p. 298)
Date
Time
LESSON
Word Values
10 2
䉬
Pretend the letters of the alphabet have the dollar values shown in the
table. For example, the letter g is worth \$7; the letter v is worth \$22.
The word jet is worth \$10 \$5 \$20 \$35.
Home Connection Children write amounts of money in
dollars-and-cents notation, and they represent an amount
of money in two different ways.
a
b
c
d
e
f
g
h
i
j
k
l
m
Value \$1 \$2 \$3 \$4 \$5 \$6 \$7 \$8 \$9 \$10 \$11 \$12 \$13
n
o
p
q
r
s
t
u
v
w
x
y
z
Value \$14 \$15 \$16 \$17 \$18 \$19 \$20 \$21 \$22 \$23 \$24 \$25 \$26
1. Which is worth more, dog or cat?
dog
zebra
2. Which is worth more, whale or zebra?
3. How much is your first name worth?
4. Write 2 spelling words you are trying to learn. Find their values.
3 Differentiation Options
Word:
Value: \$
5. What is the cheapest word you can make? It must have at least
2 letters.
SMALL-GROUP
ACTIVITY
䉴 Exploring Relationships
Value: \$
Word:
Word:
Value:
zero
Word:
5–15 Min
among Pennies, Dimes, and
Dollars
(Math Masters, p. 299)
5
\$
6. What is the most expensive word you can make?
64
Value: \$
Try This
7. Think of the letter values as dimes. For example, m is worth 13
dimes; b is worth 2 dimes. Find out how much each word is worth.
dog: \$ 2.60
cat: \$ 2.40
candy: \$ 4.70
zebra: \$ 5.20
whale: \$ 4.90
vary.
Math Journal 2, p. 232
To explore the fractional relationships among pennies, dimes, and
dollars, have children arrange 100 pennies on the 10 10 grid.
●
How many dollars are on the grid? 1 dollar
●
How many pennies are on the grid? 100 pennies
●
What part of a dollar is a penny? 100 of a dollar
●
How do you write 1 penny in dollars-and-cents notation? \$0.01
1
Student Page
Date
Time
LESSON
10 2
䉬
Math Boxes
1. Write , , or .
1,257
2,157
7,925
5,297
10,129
\$2.88 is closer to:
\$2.80
or
\$2.90
\$5.61 is closer to:
\$5.60
1,129
or
\$5.70
\$1.97 is closer to:
\$1.90
9
3. Put the heights in order. Find
or
\$2.00
4. What is the temperature?
the median height.
Unit
48 44 37 54 39
inches
A. 85F
80
C. 83F
The median height is
D. 76F
inches.
70
46
5. Draw the hour and minute
6. You have 21 pennies to share
hands to show the time 20
minutes later than 6:15.
What time
does the
clock show
now?
6 : 35
°F
B. 86F
37 , 39 , 44 , 48 , 54
44
90
11
10
12
equally among 3 children. How
many pennies does each
child get?
1
2
9
7
pennies
3
8
4
7
6
How many are left over?
5
0
pennies
114 115
Math Journal 2, p. 233
Lesson 10 2
䉬
735
Name
Date
Time
Tell children to replace each row of 10 pennies with a dime. Ask:
How Much?
10 2
䉬
Family
Note
In today’s lesson, your child practiced reading and writing money amounts using dollars and
the decimal point stand for whole dollars; the digits after the decimal point stand for cents.
When reading amounts such as “3 dollars and fifty-seven cents,” the word “and” is used to
denote the decimal point.
●
How many dollars are on your grid? 1 dollar
●
How many dimes are on your grid? 10 dimes
●
What part of a dollar is a dime? 10 of a dollar or 100 of a dollar
●
How do you write 1 dime in dollars-and-cents notation? \$0.10
90
1. ÁÁÁ‰‰ÂÎÎ
3.
\$3.
\$0.
\$0.
\$
2. ÁÁ‰‰‰‰ÍÍÍÂÂÂÂÂ
3. ‰ÍÍÎÎÎÎÎÎÎ
4. ÂÎÎÎ
57
55
52
08
1
10
5. Use Á, ‰, Í, Â, and Î to draw \$2.64 in two different ways.
or
Á‰‰‰‰ÍÍÍÍÂÂÂÂÎÎÎÎ
Practice
Solve.
6. 123 57 180
7. 84 29 55
Math Masters, p. 298
EXTRA PRACTICE
䉴 Minute Math+
SMALL-GROUP
ACTIVITY
5–15 Min
To offer children more experience with identifying groups
of coins equivalent to \$1.00, see the following page in
Minute Math+: page 64.
ELL SUPPORT
䉴 Building a Math Word Bank
Teaching Master
Name
LESSON
10 2
䉬
Date
Time
10 ⴛ 5 Grid
5–15 Min
(Differentiation Handbook)
To provide language support for money, have children use the
Word Bank template found in the Differentiation Handbook.
Ask children to write the term dollar-and-cents notation, draw a
picture representing the term, and write other related words.
Paste/tape to here to create a 10 10 grid.
Math Masters, p. 299
736
SMALL-GROUP
ACTIVITY
Unit 10 Decimals and Place Value
```