Pre-Algebra Lesson #33 Adding and Subtracting Fractions

In this lesson, we will learn how to add and subtract fractions. In order to add or subtract fractions, we must have a common denominator. If you are given a problem with unlike denominators, you will need to find the LCD, which is the LCM of the denominators. From there, you will multiply convert each fraction into an equivalent fraction with the LCD as its denominator. At that point, we can just add or subtract the numerators and place the result over the common denominator. Lastly, we will simplify the fraction by cancelling out the GCF from the numerator and denominator if necessary.

00:00 Introduction
00:24 Adding Fractions with a Common Denominator Explanation
03:22 Adding/Subtracting Fractions with a Common Denominator Examples
10:22 Procedure for Adding/Subtracting Fractions without a Common Denominator
11:27 Adding Fractions without a Common Denominator Example
14:37 Adding Fractions without a Common Denominator Explanation
18:11 Adding/Subtracting Fractions without a Common Denominator Examples
26:55 Adding/Subtracting More than Two Fractions