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Adding and Subtracting with Like and Unlike Denominators Adding and Subtracting with Like and Unlike Denominators

Adding and Subtracting with Like and Unlike Denominators - PowerPoint Presentation

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Uploaded On 2016-03-18

Adding and Subtracting with Like and Unlike Denominators - PPT Presentation

AddingSubtracting with Like Denominators Like denominators are denominators that are the same Steps 1 If there are whole numbers add or subtract the whole numbers 2 Add or subtract the numerators ID: 260776

denominators step stays denominator step denominators denominator stays add simplify numbers subtract subtracting 8step adding examples numerators steps answer

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Presentation Transcript

Slide1

Adding and Subtracting with Like and Unlike DenominatorsSlide2

Adding/Subtracting with

Like

Denominators

Like denominators are denominators that are the same

Steps:

1.) If there are whole numbers, add or subtract the whole numbers.

2.) Add or subtract the numerators

3.) The denominator

stays the same!

4.) Simplify if necessarySlide3

Examples

5

3

/

8

+ 3 1/8 Step 1: 5 + 3 = 8Step 2: 3 + 1 = 4Step 3: denominator stays 8ANSWER: 8 4/8 (you may or may not need to simplify)

5

3

/

8

– 3

1

/

8

Step 1: 5 – 3 = 2

Step 2: 3 – 1 = 2

Step 3: denominator stays 8

ANSWER: 2

2

/

8

(you may or may not need to simplify)Slide4

Adding/Subtracting with

Unlike

Denominators

Unlike denominators are denominators that are not the same.

Steps:

1.) If there are whole numbers, add or subtract the whole numbers.2.) Find a common denominator (LCM) and make equivalent fractions3.) Add or subtract the numerators4.) The (new) denominator stays the same!5.) Simplify if necessarySlide5

Examples

7

7

/

8

+ 3 ¾ Step 1: 7 + 3 = 10Step 2: 7/8 + ¾ = 7/8 + 6/8Step 3: 7 + 6 = 13Step 4: 8 stays the denominatorANSWER: 10 13/8Step 5: since 13/8 is an improper fraction you have to simplify to 1 5/8 and add it to the whole number

10 + 1

5

/

8

= 11 5/8

7

7

/

8

– 3 ¾

Step 1: 7 – 3 = 4

Step 2:

7

/

8

6

/

8

Step 3: 7 – 6 = 1

Step 4: 8 stays the denominator

ANSWER: 4

1

/

8