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
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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