Watch Video on Adding Fractions - Math Help
Tuesday, June 16th, 2009
Access full lesson containing this video at: http://www.yourteacher.com/algebra1/addingfractions.php Students learn to add or subtract fractions using the least common denominator, which is the least common multiple for the denominators of the fractions. Once the fractions are given a common denominator by multiplying the numerator and denominator of each fraction by the appropriate number, then the fractions can be added or subtracted by adding or subtracting the numerators, and leaving the denominator the same.
Duration : 0:2:55
Access full lesson containing this video at: http://www.yourteacher.com/prealgebra/reducingfractions.php Students learn that a fraction is in lowest terms if the Greatest Common Factor of the numerator and denominator is 1. For example, 3/5 is in lowest terms, because the Greatest Common Factor of 3 and 5 is 1. However, 3/6 is not in lowest terms, because the Greatest Common Factor of 3 and 6 is 3. Students also learn that a fraction can be rewritten in lowest terms by dividing the numerator and denominator by their Greatest Common Factor. For example, to write 10/15 in lowest terms, divide the numerator and denominator by their Greatest Common Factor of 5, to get 2/3.