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5HDGZULWHDQGFRPSDUHGHFLPDOVWRWKRXVDQGWKV
NS 1.1*1%7
Estimate,
round, and manipulate very large (e.g., millions) and
UNDERLYING SKILLS AND CONCEPTS:
very small (e.g., thousandths) numbers.
use place value;
understand numbers less than 1
Understand Decimal Place Value
A decimal is a fractional number with a denominator of 10, 100,
1,000 or some other power of ten. A decimal number is written with
a decimal point, “.”. The decimal point separates the whole
number part from the fractional part. Like whole numbers, digits in
decimal numbers have a place value.
9
,
Hundreds
Tens
Ones
6
3
2
Look at the decimal point.
To the left, the digits show how many
ones, tens, hundreds, thousands, ...
E x am p l E
Tenths
.
Hundredths Thousandths
1
2
8
To the right, the digits show how many
tenths, hundredths, thousandths ,...
If the decimal is less than 1, write a 0 in
the ones place.
1
Read the number 0.4 as a decimal.
The place value chart shows four tenths, 0.4.
To read a decimal number that has no ones, skip the 0. Then read the
number as you usually would and look at the value of the last digit.
The 4 is in the tenths place, so read “four tenths.”
E x am p l E
Ones
0
2
Ones
Tenths
Read the number 0.25 as a decimal.
0 .
2
The place value chart shows the number 0.25.
To read a decimal, read the number as you usually would, 25.
Then look at the value of the last digit.
The digit 5 is in the hundredths place, so 0.25 is “twenty-five hundredths.”
What is the value of the 5 in 0.25? 5 hundredths.”
E x am p l E
3
Read 3.047. Read the decimal in words.
To read the decimal with some ones,
read the number as you would a whole number.
Use “and” to tell where the decimal point is.
Then look at the value of the last digit.
So, 3.047 is “three and forty-seven thousandths”.
page 134
Ones
3
Tenths
.
0
Tenths
.
4
Hundredths
5
Hundredths Thousandths
4
7
Chapter 12 – Lesson 1
E – © CSL Associates, Inc. All rights reserved.
Thousands
Name
P RAC T I C E
Write the decimal in digits for each word form.
1. two tenths
2. seven hundredths
3. seventy-two hundredths
4. twenty-nine hundredths
5. six thousandths
6. sixty-one thousandths
7. six tenths
8. eight hundred thirty-two thousandths
9. four hundred four thousandths
10. two and three tenths
0.2
0.07
0.72
0.29
0.006
0.061
0.6
0.832
0.404
2.3
Read each number aloud. What is the value of the digit 5 in each number?
E – © CSL Associates, Inc. All rights reserved.
11.
12.
13.
14.
15.
0.5
0.05
0.53
7.065
87.356
5 tenths; tenths place
5 hundredths; hundredths place
53 hundredths; tenths place
7 and 65 thousandths, thousandths place
87 and 356 thousandths; hundredths place
What decimal does each model show? Write the decimal in digits and in words.
17.
16.
.
1.2 or 1.20;
one and twenty hundredths
Math
Reasoning
.
0.98;
ninety-eight hundredths
Number Sense
MR 1.1, 2.3
2.50
18. Draw a line between pairs of decimals
that represent the same value.
0.205
0.52
520.0
0.250
0.25
Have students read
each decimal aloud.
0.520
Chapter 12 – Lesson 1
page 135
MCX94.HW.CL.G5.FM&Lesson.v211
8/2/04
18:02
Page 90
Name
…at home!
P RAC T I C E
Write the decimal in digits for each word form.
1. three tenths
2. eight hundredths
3. ninety-one hundredths
4. thirteen hundredths
5. five thousandths
6. fifty-one thousandths
7. seven tenths
8. nine hundred nineteen thousandths
9. three hundred six thousandths
10. four and five tenths
0.3
0.08
0.91
0.13
0.005
0.051
0.7
0.919
0.306
4.5
Read each number aloud. What is the value of the digit 8 in each number?
0.58
fifty-eight hundredths; eight hundredths
0.058
fifty-eight thousandths; eight thousandths
8.53
eight and 53 hundredths; eight ones
7.085
seven and eighty-five thousandths; eight hundredths
87.356 eighty-seven and three hundred fifty-six thousandths; eight tens
What decimal does each model show? Write the decimal in digits and in words.
17.
16.
.
.
1.30;
one and thirty hundredths
Math
Reasoning
0.89;
eighty-nine hundredths
Number Sense
MR 1.1, 2.3
2.50
18. Draw a line between pairs of decimals
that represent the same value.
0.205
0.52
520.0
0.250
0.25
0.520
page 90
Home Resource and Homework
Chapter 12 Lesson 1
E – © CSL Associates, Inc. All rights reserved.
11.
12.
13.
14.
15.
MCX94TEG5CH01_32.v7.4.2 2/24/01 19:45 Page 249
Name
P RAC T I C E
Write the decimal in digits for each word form.
1. two tenths
2. seven hundredths
3. seventy-two hundredths
4. twenty-nine hundredths
5. six thousandths
6. sixty-one thousandths
7. six tenths
8. eight hundred thirty-two thousandths
9. four hundred four thousandths
10. two and three tenths
0.2
0.07
0.72
0.29
0.006
0.061
0.6
0.832
0.404
2.3
Read each number aloud. What is the value of the digit 5 in each number?
E – © CSL Associates, Inc. All rights reserved.
11.
12.
13.
14.
15.
0.5
0.05
0.53
7.065
87.356
5 tenths; tenths place
5 hundredths; hundredths place
53 hundredths; tenths place
7 and 65 thousandths, thousandths place
87 and 356 thousandths; hundredths place
What decimal does each model show? Write the decimal in digits and in words.
17.
16.
.
1.2 or 1.20;
one and twenty hundredths
Math
Reasoning
.
0.98;
ninety-eight hundredths
Number Sense
MR 1.1, 2.3
2.50
18. Draw a line between pairs of decimals
that represent the same value.
0.205
0.52
520.0
0.250
0.25
Have students read
each decimal aloud.
0.520
Chapter 12 – Lesson 1
Student Book Page
page 135
Name
…at home!
P RAC T I C E
Write the decimal in digits for each word form.
1. three tenths
2. eight hundredths
3. ninety-one hundredths
4. thirteen hundredths
5. five thousandths
6. fifty-one thousandths
7. seven tenths
8. nine hundred nineteen thousandths
9. three hundred six thousandths
10. four and five tenths
0.3
0.08
0.91
0.13
0.005
0.051
0.7
0.919
0.306
4.5
Read each number aloud. What is the value of the digit 8 in each number?
0.58
fifty-eight hundredths; eight hundredths
0.058
fifty-eight thousandths; eight thousandths
8.53
eight and 53 hundredths; eight ones
7.085
seven and eighty-five thousandths; eight hundredths
87.356 eighty-seven and three hundred fifty-six thousandths; eight tens
What decimal does each model show? Write the decimal in digits and in words.
17.
16.
.
.
1.30;
one and thirty hundredths
Math
Reasoning
0.89;
eighty-nine hundredths
Number Sense
MR 1.1, 2.3
2.50
18. Draw a line between pairs of decimals
that represent the same value.
0.205
0.52
520.0
0.250
0.25
0.520
page 90
Home Resource and Homework
Chapter 12 Lesson 1
E – © CSL Associates, Inc. All rights reserved.
11.
12.
13.
14.
15.