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Adding and Subtracting Fractions (with unlike denominators) Worksheets




Objective: I can add and subtract fractions with the unlike denominators.


When adding or subtracting fractions with unlike denominators

Step 1: Find the lowest common denominator

Step 2: Find the equivalent fraction(s).

Step 3: Add or subtract the fractions

Step 4: Simplify the answers


(Think of the lowest common denominator as the smallest multiple that they have in common.)


Read this if you need to learn about adding and subtracting fractions.


Example:

4/9 + 2/3 =

Lowest common denominator = 9

Equivalent fractions with common denominator
4/9 = 4/9

2/3 = 6/9

Add the equivalent fractions, simplify the answer
10/9 = 1 1/9

Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
Problem 1:
2/3 + 1/6 =
Lowest common denominator =
Equivalent fractions with common denominator
2/3 = /
1/6 = /
Add the equivalent fractions
/

Problem 2:
1/2 + 2/3 =
Lowest common denominator =
Equivalent fractions with common denominator
1/2 = /
2/3 = /
Add the equivalent fractions and simplify
/ = /

Problem 3:
7/121/3 =
Lowest common denominator =
Equivalent fractions with common denominator
7/12 = /
1/3 = /
Subtract the equivalent fractions and simplify
/ = /

Problem 4:
4/52/3 =
Lowest common denominator =
Equivalent fractions with common denominator
4/5 = /
2/3 = /
Subtract the equivalent fractions
/



 

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