Everyday MathGrade 4 – Lesson 4.4
Decimal Addition and Subtraction
Copyright © 2011 Kelly Mott
Lesson Components:Part 1: Math Boxes 4.4 Page 90Part 2: ReviewPart 3: PowerPoint LessonPart 4: Math Journal Page 88Part 5: Math Journal Page 89Part 6: Additional SheetsAdd and Subtract Decimals SheetMath Masters Page 54
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Math Boxes Lesson 4.4
Page 90
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Math Box 1:
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Math Box 2:
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Math Box 3:
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Math Box 4:
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Math Box 5:
Everyday MathGrade 4 – Lesson 4.4
Decimal Addition and Subtraction
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PART 1: REVIEW
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When we write numbers, the position or “place” of each number is important.
Place Value
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• The first place to the right of the decimal represents the tenths place.
EXAMPLE:
The Tenths Place
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.3 or 310=
• Let’s Practice. • Write the decimal and the fraction for
each.
The Tenths Place
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or=
• The second place to the right of the decimal represents the hundredths
place.
The Hundredths Place
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=.26 or 26100
• Let’s Practice. • Write the decimal and the fraction for
each.
The Hundredths Place
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or=
A mixed number is a whole number and a fraction or a part of a whole.
Mixed Numbers
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2.8 or 2 810
Mixed Numbers
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or
Mixed Numbers
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or
5 tenths
Write the Decimal
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50 hundredths
7 hundredths
Write the Decimal
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6 tenths
When we compare numbers, we often use symbols.
Comparing Decimals
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When comparing numbers, think of Pac Man or an alligator. They EAT the BIGGER number.
Comparing Decimals
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Use the >, <, or = sign to complete the following:
Comparing Decimals
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Use the >, <, or = sign to complete the following:
Comparing Decimals
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Use the >, <, or = sign to complete the following:
Comparing Decimals
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Use the >, <, or = sign to complete the following:
Comparing Decimals
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.3 .13
Compare ( > < =)
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H Tens Ones Tenths Hundredths.
.
.
.06 .4H Tens Ones Tenths Hundr
edths...
.53 .35
Compare ( > < =)
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H Tens Ones Tenths Hundredths.
.
.
.7 .70H Tens Ones Tenths Hundr
edths...
• Line up the numbers. Then put them in order. Cross out the numbers as you go.
• Now put them in order from least to greatest:
________ ________ ________ ________ ________
ORDER: LEAST TO GREATEST
H Tens Ones Tenths Hundredths
.
.
.
.
.
Order these numbers:0.04, 0.4, 0.44, 4.4
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• Line up the numbers. Then put them in order. Cross out the numbers as you go.
• Now put them in order from greatest to least:
________ ________ ________ ________ ________
ORDER: GREATEST TO LEAST
H Tens Ones Tenths Hundredths
.
.
.
.
.
Order these numbers:0.02, 0.20, 0.22, 2.02
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PART 2: ADD DECIMALS
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ADDING DECIMALS 1
2.78 9.10
3.36 8.49
+ +
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ADDING DECIMALS 2
96.45 23.96
21.06 19.49
+ +
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PART 3: SUBTRACT DECIMALS
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SUBTRACT DECIMALS 1
9.87 4.69
0.40 0.37
- -
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SUBTRACT DECIMALS 2
13.62 4.90
29.40 25.60
- -
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PART 4: ADD THREE DECIMALS
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ADDING DECIMALS 1
11.17 7.60 12.03
+ +
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2.78 8.42 15.01
+
PART 5: SOLVE & COMPARE
( > < =)Copyright © 2011 Kelly Mott
PRACTICE 1:
2.78 + 9.1 3.36 +8.49
PRACTICE 2:
0.08 + 0.97 1.04 + 0.03
=
SOLVE & COMPARE ( > < =)
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PRACTICE 3:
13.62 – 4.9 9.4 – 1.33
PRACTICE 4:
9.4 – 5.6 8.3 – 4.7
=
SOLVE & COMPARE ( > < =)
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PART 5:
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http://www.ixl.com/
Does this make sense?
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a
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HOMEWORKPage 88
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HOMEWORKPage 89
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HOMEWORK Adding and Subtracting Decimals
Worksheet
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HOMEWORK Math Masters Page 54
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