# 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

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

Example:

4/9 + 2/3 =

Lowest common denominator = 9

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

2/3 = 6/9

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 = /
/

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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