Model Decimals With Base-10 Blocks Page 6
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7Home Link Master
Name
Date
Time
Children exchange each row of 10 pennies on their 10-by-10 grid
HOME LINK
Understanding Decimals
for a dime. Ask:
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Do the coins on the grid still add up to one dollar?
yes
Family
Your child has been using grids like the ones below to understand the meaning of decimals.
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1
Note
The grid is made up of 100 squares. Each square is
or 0.01 of the grid.
100
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1
Ten squares is
or 0.10 of the grid. 0.8 is read as “eight-tenths.” 0.04 is read as
10
“four-hundredths.” 0.53 is read as “fifty-three hundredths.”
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How many dimes are on your grid?
10 dimes
33
Please return this Home Link to school tomorrow.
If the grid is ONE, then what part of each grid is shaded?
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What part of a dollar is a dime?
Write a fraction and a decimal below each grid.
10
1.
2.
3.
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Write 1 dime in decimal notation on your slate.
$0.10
Children count their dimes using calculators. Have them share
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3
30
9
65
their ideas about what they need to enter into the calculator to
or
10
100
100
100
fraction:
fraction:
fraction:
0.09
0.65
0.3 or 0.30
count the tenths of a dollar.
Casio key sequence: 0.10 [+] [+] 0
decimal:
decimal:
decimal:
4.
Which decimal is greater? Use the grids to help you.
[=] [=] ...
0.3
0.65
0.65
0.3 or 0.09
0.09 or 0.65
0.3 or 0.65
TI key sequence: 0.10 [+] [=] [=] ...
5.
6.
7.
Color 0.8 of the grid.
Color 0.04 of the grid.
Color 0.53 of the grid.
As soon as they put in the first [=], most calculators will change
the display and drop the 0 in the hundredths place. Review with
children that this is another way to write tenths. Children choral
8.
Write 0.8, 0.04, and 0.53 in order from smallest to largest.
count as the calculator counts up: one tenth, two tenths, and so on.
0.04
0.53
0.8
Use the grids to help you.
Math Masters, p. 139
INDEPENDENT
ENRICHMENT
ACTIVITY
EM3MM_G3_U05_119-166.indd 139
1/7/11 3:28 PM
Writing Names on
15–30 Min
Hundred Grids
(Math Masters, p. 140)
To further explore representing decimal numbers on a 100 grid,
have children write each letter of their first names on a separate
100 grid. (See margin.) They figure out the decimal value of each
letter and label the letter with the decimal number. If appropriate,
The value of this letter K on a
have children use a calculator to add the values of individual
hundred grid is 0.2 or .20.
letters to figure out the total value of the letters in their names
using the 100 grid as the whole.
Teaching Master
You may want to have children cut out the grids they have made,
Name
Date
Time
paste them onto construction paper to form their names, label
Writing Names on Hundred Grids
LESSON
each letter with its decimal value, and display them in the room.
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SMALL-GROUP
ELL SUPPORT
ACTIVITY
Building a Math Word Bank
5–15 Min
(Differentiation Handbook, p. 132)
To provide language support for decimals, have children use the
Word Bank template found on Differentiation Handbook, page 132.
Ask children to write the terms tenths and hundredths, draw a
picture representing each term, and write other related words.
See the Differentiation Handbook for more information.
Math Masters, p. 140
EM3MM_G3_U05_119-166.indd 140
12/28/10 10:06 AM
Lesson 5 7
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