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Transcript 
Chapt
Name:
Date:
er
Adding and
Subtracting Decimals
Practice 1
Adding Decimals
Fill in the blanks. Write each sum as a decimal.
© 2009 Marshall Cavendish International (Singapore) Private Limited
Example
1.
0.3 0.5 3
tenths 8
tenths
0.8
0.8 0.2 tenths 5
tenths
tenths
tenths
2.
0.7 0.7 tenths tenths
tenths
3.
0.9 0.8 tenths tenths
tenths
Lesson 8.1 Adding Decimals
G4B_WB_Ch_08.indd 21
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Fill in the blanks.
Line up the decimal
points.
Step 1
4.
4.8
3.6
Add the tenths.
8 tenths 6 tenths tenths
Regroup the tenths.
one and
tenths
Step 2
4.8
3.6
Add the ones.
4 ones 3 ones So, 4.8 3.6 one ones
.
© 2009 Marshall Cavendish International (Singapore) Private Limited
tenths Add.
5.
8.5
2.3
6.
6.6
1.6
Write in vertical form. Then add.
7.
22
G4B_WB_Ch_08.indd 22
15.7 3.8 8.
22.9 7.2 Chapter 8 Adding and Subtracting Decimals
2/25/09 3:23:07 AM
Name:
Date:
Practice 2
Adding Decimals
Fill in the blanks. Write each sum as a decimal.
Example
© 2009 Marshall Cavendish International (Singapore) Private Limited
1.
0.02 0.04 2
hundredths 6
hundredths
0.06
0.03 0.07 hundredths 4
hundredths
hundredths
hundredths
2.
0.06 0.08 hundredths hundredths
hundredths
3.
0.09 0.05 hundredths hundredths
hundredths
Lesson 8.1 Adding Decimals
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Fill in the blanks.
4.
Step 1
Line up the decimal
points.
2.34
0.87
Add the hundredths.
4 hundredths 7 hundredths
hundredths
hundredths tenth
hundredth
Step 2
2.34
0.87
Add the tenths.
3 tenths 8 tenths tenth tenths
one and
tenths
Regroup the tenths.
tenths © 2009 Marshall Cavendish International (Singapore) Private Limited
Regroup the hundredths.
Step 3
24
G4B_WB_Ch_08.indd 24
2.34
0.87
Add the ones.
2 ones 0 ones one So, 2.34 0.87 .
ones
Chapter 8 Adding and Subtracting Decimals
2/25/09 3:23:07 AM
Name:
Date:
Add.
5.
0.02
0.35
6.
0.06
0.46
© 2009 Marshall Cavendish International (Singapore) Private Limited
Write in vertical form. Then add.
7.
$0.57 $0.29 $
8.
3.6 0.54 9.
$0.78 $0.88 $
10.
7.25 1.78 Lesson 8.1 Adding Decimals
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Derek hops two steps on each number line.
Which decimal does he land on?
Write the correct decimal in each box.
Example
2.42
0.9
0
1.0
2.0
3.0
4.0
11.
1.26
10.0
2.57
11.0
12.
51.0
13.
1.2
14.0
1.83
52.0
53.0
0.36
1.0
G4B_WB_Ch_08.indd 26
13.0
2.69
50.0
26
12.0
1.4
54.0
© 2009 Marshall Cavendish International (Singapore) Private Limited
3.32
55.0
0.38
1.6
1.8
2.0
Chapter 8 Adding and Subtracting Decimals
2/25/09 3:23:07 AM
Name:
Date:
Practice 3
Subtracting Decimals
Fill in the blanks. Write each difference as a decimal.
Example
© 2009 Marshall Cavendish International (Singapore) Private Limited
1.
0.9 0.4 9
tenths 5
tenths
0.5
1 0.3 tenths 4
tenths
tenths
tenths
2.
1.3 0.6 tenths tenths
tenths
3.
1.8 0.9 tenths tenths
tenths
Lesson 8.2
G4B_WB_Ch_08.indd 27
Subtracting Decimals
27
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Fill in the blanks.
4.
Step 1
3.5
1.7
You cannot subtract 7 tenths from 5 tenths.
So, regroup 3 ones and 5 tenths.
3 ones and 5 tenths
ones and
tenths
Subtract the tenths.
tenths 7 tenths tenths
Step 2
3.5
1.7
Subtract the ones.
ones G4B_WB_Ch_08.indd 28
one
one
So, 3.5 1.7 28
© 2009 Marshall Cavendish International (Singapore) Private Limited
.
Chapter 8 Adding and Subtracting Decimals
2/25/09 3:23:07 AM
Name:
Date:
Subtract.
5.
6.
4.6
2.2
7.4
6.5
Write in vertical form. Then subtract.
© 2009 Marshall Cavendish International (Singapore) Private Limited
7.
6.7 2.4 8.
3 1.3 Fill in the blanks. Write each difference as a decimal.
Example
9.
0.08 0.02 8
hundredths 6
hundredths
0.06
0.23 0.19 hundredths 2
hundredths
hundredths
hundredths
10.
0.1 0.06 hundredths hundredths
hundredths
Lesson 8.2
G4B_WB_Ch_08.indd 29
Subtracting Decimals
29
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Fill in the blanks.
11.
Step 1
4.23
1.54
You cannot subtract 4 hundredths from 3 hundredths.
So, regroup 2 tenths 3 hundredths.
2 tenths 3 hundredths
tenth
hundredths
Subtract the hundredths.
hundredths hundredths
hundredths
Step 2
4.23
1.54
tenth.
You cannot subtract 5 tenths from
So, regroup 4 ones and
4 ones and
© 2009 Marshall Cavendish International (Singapore) Private Limited
tenth.
tenth
ones and
tenths
Subtract the tenths.
tenths 5 tenths 30
G4B_WB_Ch_08.indd 30
tenths
Chapter 8 Adding and Subtracting Decimals
2/25/09 3:23:07 AM
Name:
Date:
Step 3
4.23
1.54
Subtract the ones.
ones 1 one So, 4.23 1.54 ones
.
© 2009 Marshall Cavendish International (Singapore) Private Limited
Subtract.
13.
0.39
0.07
15.
2.35
0.48
17.
10.13
7.18
12.
14.
16.
0.51
0.36
12.45
10.63
20
14.56
Lesson 8.2
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Subtracting Decimals
31
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18.
5.38 2.73 19.
1.06 0.38 20.
5.6 1.72 21.
3 0.42 32
G4B_WB_Ch_08.indd 32
© 2009 Marshall Cavendish International (Singapore) Private Limited
Write in vertical form. Then subtract.
Chapter 8 Adding and Subtracting Decimals
2/25/09 3:23:07 AM
Name:
Date:
Practice 4 Real-World Problems: Decimals
Solve. Show your work.
Example
1 pound of grapes costs $1.79 and 1 pound of peaches costs $1.49.
What is the total cost of 1 pound of grapes and 1 pound of peaches?
© 2009 Marshall Cavendish International (Singapore) Private Limited
Cost of grapes + cost of peaches = total cost
$1.79 + $1.49 = $3.28
The total cost of 1 pound of grapes
and 1 pound of peaches is $3.28.
1.
A tank is full of water. After 16.5 liters of water are used,
8.75 liters of water are left. How much water was in the full tank?
2.
A piece of fabric is 4.5 yards long. A customer buys 2.35 yards of the fabric.
How many yards of fabric are left?
3.
Mr. Larson lives 8.7 miles from school. He was driving home
from school and stopped 3.5 miles along the way at a supermarket.
How much farther does he have to drive before he reaches home?
Lesson 8.3
G4B_WB_Ch_08.indd 33
Real-World Problems: Decimals
33
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A grocery store is having a sale. A loaf of wheat bread
regularly costs $2.29, but the sale price is $1.79.
The store is also offering 50c/ off on a gallon of fresh milk.
If Mrs. Larson buys a gallon of fresh milk and a loaf
of wheat bread, how much does she save on her purchases?
5.
Lily bought a skirt for $25.90 and a shirt for $19.50.
She paid the cashier $50. How much change did she receive?
6.
Shannon collects rainwater to water her flowers.
She has one bucket with 3.4 gallons of water
and another with 1.85 gallons less.
She uses both buckets to water the flowers.
How many gallons of water does she use?
34
G4B_WB_Ch_08.indd 34
© 2009 Marshall Cavendish International (Singapore) Private Limited
4.
Chapter 8 Adding and Subtracting Decimals
2/25/09 3:23:07 AM
Name:
Date:
Put On Your Thinking Cap!
© 2009 Marshall Cavendish International (Singapore) Private Limited
Challenging Practice
1.
Miguel subtracts two numbers and gets the answer 4.95.
The lesser of the two numbers is 3.4.
What is the other number?
2.
Julia subtracts two numbers and gets the answer 6.8.
The greater of the two numbers is 10.55.
What is the other number?
Chapter 8 Adding and Subtracting Decimals
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Put On Your Thinking Cap!
Problem Solving
1.
The number in each rectangle is the sum of the numbers
in the two circles next to it. Find the numbers in the circles.
1.4
0.9
B
C
1.7
2.
36
G4B_WB_Ch_08.indd 36
Each week, Rena saves $5. Her brother saves $2.50 less each week, but he
started saving 4 weeks earlier. After how many weeks will Rena’s savings be
equal to her brother’s?
© 2009 Marshall Cavendish International (Singapore) Private Limited
A
Chapter 8 Adding and Subtracting Decimals
2/25/09 3:23:07 AM
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