Find the Denominator
Decide whether the fractions already have a common denominator or find the least common denominator.
Free Interactive Math Practice
Adding and Subtracting Fractions
Practice adding and subtracting fractions one step at a time by finding a common denominator, rewriting each fraction, combining the numerators, and simplifying the result.
Start practicingLearn the Fraction Rules First
Learn how to find the least common denominator, rewrite equivalent fractions, combine numerators correctly, simplify your answers, and avoid common fraction mistakes before beginning the practice activity.
Read the Fraction GuideLearn the process
Solve Each Problem Step by Step
Instead of entering only the final answer, you will work through each important part of the fraction problem.
Rewrite the Fractions
Create equivalent fractions so both fractions have the same denominator.
Add or Subtract
Combine the numerators while keeping the common denominator.
Simplify
Reduce the fraction to its simplest form whenever possible.
Practice Mode
Work Through the Problem
Correct
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Problems
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Streak
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Solve:
1
3
+
1
6
1
Denominator
2
Rewrite
3
Combine
4
Simplify
Step 1
Find the least common denominator.
What is the smallest number that both denominators divide into evenly?
Current problem
Step 2
Rewrite both fractions.
Enter equivalent fractions with the common denominator.
Current problem
Step 3
Combine the fractions.
Add or subtract the numerators. Keep the common denominator.
Combine
Step 4
Simplify the fraction.
Write the answer in simplest form.
Simplify this fraction
Great job!
You completed every step correctly.
Remember
Fraction Addition and Subtraction Rules
Same Denominators
Add or subtract the numerators and keep the denominator the same.
3/8 + 2/8 = 5/8
Different Denominators
Find a common denominator before adding or subtracting the numerators.
1/3 + 1/6 = 2/6 + 1/6
Simplify the Result
Divide the numerator and denominator by their greatest common factor.
3/6 = 1/2
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