# Addition and Subtraction Involving Fractions, decimals, and mixed numbers - PowerPoint PPT Presentation

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## Addition and Subtraction Involving Fractions, decimals, and mixed numbers

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### Title: Addition and Subtraction Involving Fractions, decimals, and mixed numbers Last modified by: Melanie Krempin Document presentation format – PowerPoint PPT presentation

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Title: Addition and Subtraction Involving Fractions, decimals, and mixed numbers

1
decimals, and mixed numbers
• Lesson 1 (3rd 6 Weeks)
• TEKS 6.2B

2
• Line up decimals, add zeros at the end of the
numbers so each one has the same number of
decimal places
• Add subtract like whole numbers, regrouping as
needed.
• Bring decimal straight down in the answer.

3
EX
• Find the difference between 33.5 and 8.35

4
2
33.5
0
1
1
- 8.35
.
5
1
5
2
4
/- Fractions Mixed Numbers
• If the fractions have the same denominator,
add/subtract the numerators and use the same
denominator.
• EX

6 8
14
8
6

17
17
17
17
5
• If the fraction have unlike denominators, rewrite
them as fractions with a common denominator. Then
add/subtract the numerators and use the common
denominator.
• When adding/subtracting mixed numbers the
whole-number and fractional parts may need to be
regrouped.
• If necessary, simplify the answer.

6
EX
1
1
x 1
8
8
x 1
1 6 7
6
3
x 2

4
8
x 2
7
8
7
EX
16
2
x 8
3
24
x 8
16 15 1
15
5
x 3
-
8
24
x 3
1
24
8
EX
10
20
x 2
30
15
x 2
2
10
x 5
-
6
30
x 5
10
10
1

3
10
30
9
EX
1
5
x 5
2
4
20
x 5
2
8
x 4
3

5
20
x 4
13
5
20
10
EX
21
3
18

1

18
18
18
1
3
21
x 3
8
7
6
18
x 3
8
4
x 2
3
-
18
9
x 2
13
4
18