everyday math grade 4 – lesson 4.4 decimal addition and subtraction copyright © 2011 kelly mott

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



Math Boxes Lesson 4.4

Page 90


Math Box 1:


Math Box 2:


Math Box 3:


Math Box 4:


Math Box 5:

Everyday MathGrade 4 – Lesson 4.4

Decimal Addition and Subtraction


PART 1: REVIEW


When we write numbers, the position or “place” of each number is important.

Place Value


• The first place to the right of the decimal represents the tenths place.

EXAMPLE:

The Tenths Place


.3 or 310=

• Let’s Practice. • Write the decimal and the fraction for

each.

The Tenths Place


or=

• The second place to the right of the decimal represents the hundredths

place.

The Hundredths Place


=.26 or 26100

• Let’s Practice. • Write the decimal and the fraction for

each.

The Hundredths Place


or=

A mixed number is a whole number and a fraction or a part of a whole.

Mixed Numbers


2.8 or 2 810

Mixed Numbers


or

5 tenths

Write the Decimal


50 hundredths

7 hundredths

Write the Decimal


6 tenths

When we compare numbers, we often use symbols.

Comparing Decimals


When comparing numbers, think of Pac Man or an alligator. They EAT the BIGGER number.

Comparing Decimals


Use the >, <, or = sign to complete the following:

Comparing Decimals


.3 .13

Compare ( > < =)


H Tens Ones Tenths Hundredths.

.

.

.06 .4H Tens Ones Tenths Hundr

edths...

.53 .35

Compare ( > < =)


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


• 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


PART 2: ADD DECIMALS


ADDING DECIMALS 1

2.78 9.10

3.36 8.49

+ +


ADDING DECIMALS 2

96.45 23.96

21.06 19.49

+ +


PART 3: SUBTRACT DECIMALS


SUBTRACT DECIMALS 1

9.87 4.69

0.40 0.37

- -


SUBTRACT DECIMALS 2

13.62 4.90

29.40 25.60

- -


PART 4: ADD THREE DECIMALS


ADDING DECIMALS 1

11.17 7.60 12.03

+ +


2.78 8.42 15.01

+

PRACTICE 1:

2.78 + 9.1 3.36 +8.49

PRACTICE 2:

0.08 + 0.97 1.04 + 0.03

=

SOLVE & COMPARE ( > < =)


PRACTICE 3:

13.62 – 4.9 9.4 – 1.33

PRACTICE 4:

9.4 – 5.6 8.3 – 4.7

=

SOLVE & COMPARE ( > < =)


PART 5:


http://www.ixl.com/

http://www.ixl.com/

Does this make sense?


a


HOMEWORKPage 88


HOMEWORKPage 89


HOMEWORK Adding and Subtracting Decimals

Worksheet


HOMEWORK Math Masters Page 54


everyday math grade 4 – lesson 4.4 decimal addition and subtraction copyright © 2011 kelly mott

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