Watch Video on Adding Fractions – Math Help
Monday, February 1st, 2010
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/dividingfractions.php Students learn to divide fractions by first changing the division sign to multiplication and flipping the second fraction. For example, to simplify 7/12 divided by 7/9, first change the division sign to multiplication and flip the second fraction, to get 7/12 x 9/7. Next, multiply the fractions by first cross-canceling, then multiplying across the numerators and across the denominators.
Access full lesson containing this video at: http://www.yourteacher.com/algebra1/lcm.php Students learn to find the least common multiple (LCM) given two integers, and the least common multiple given three integers.