Fractions
A series of free Pre-Algebra Lessons.
Adding Fractions
How to add fractions with like denominators?
- Add the numerators, keeping the same denominator.
- Simplify if possible.
How to add fractions with unlike denominators?
- Find the least common multiple of the denominators. This is called the least common denominator (LCD).
- Create equivalent fractions with the same denominator.
- Add the numerators, keep the same denominator.
- Simplify if possible.
This video explains how to add fractions with like and unlike denominators. It explains why we must have a common denominator when adding fractions.
Subtracting Fractions
How to subtract fractions with like denominators?
- Add the numerators, keeping the same denominator.
- Simplify if possible.
How to subtract fractions with unlike denominators?
- Find the least common multiple of the denominators. This is called the least common denominator (LCD).
- Create equivalent fractions with the same denominator.
- Subtract the numerators, keep the same denominator.
- Simplify if possible.
This video explains how to subtract fractions with like and unlike denominators. It explains why we must have a common denominator when subtracting fractions.
Adding Mixed Numbers
How to add Mixed Numbers?
- Obtain a common denominator for the fractions.
- Add
- If the sum has an improper fraction, convert it to a mixed number and add it to the whole number.
- Simplify if possible.
Subtracting Mixed Numbers
How to subtract Mixed Numbers?
- Obtain a common denominator.
- Check to see if you need to borrow.
- Subtract the fractions and then the whole numbers.
- Simplify if possible.
Multiplying and Dividing Mixed Numbers
How to multiply Mixed Numbers?
- Convert the mixed number to an improper fraction.
- Simplify if possible.
- Multiply.
- Convert back to a mixed number.
How to divide Mixed Numbers?
- Convert the mixed number to an improper fraction.
- Rewrite the division problem as a multiplication problem.
- Simplify if possible.
- Multiply.
- Convert back to a mixed number.
Check out our most popular games!
Fraction Concoction Game:
Master fractions in the lab: mix, add, and subtract beakers to create the perfect concoction!
Fact Family Game:
Complete fact families and master the link between addition & subtraction and multiplication & division.
Number Bond Garden:
Clear the board by matching number pairs that sum to ten in this garden-themed mental math puzzle.
Online Addition Subtraction Game:
Practice your addition and subtraction skills to help the penguin find its mummy.
Penguin Solitaire
Penguin Solitaire is a fun game that aims to move all cards to the foundations to build four full sequences. There are two versions here: Penguin (Tuxedo) and Penguin (Original).
We welcome your feedback, comments and questions about this site or page. Please submit your feedback or enquiries via our Feedback page.