Adding Fractions with Unlike Denominators - Part 1 (Fraction Addition)

More Lessons: www.MathAndScience.com
Twitter: / jasongibsonmath
In this lesson, we will learn the very important skill of adding fractions. In this case, we will add fractions that have unlike denominators, which means that the bottom numbers of the fractions are not the same. In order to add fractions, the denominator of both fractions must equal the same number. In these problems, the first step is to change the fractions by multiplying the numerator and denominator by the same number with the goal of expressing both fractions in terms of the same denominator. Then, we add the fractions as usual and simplify the result. Here we use fraction models to understand what it means to find a common denominator and to fully understand what it means to add fractions together.

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I noticed that the common denominator is usually the larger denominator of the two fractions within the problem. And multiplying the smaller denominator of the two fractions by a number that makes it equivalent to the larger denominator to find the common, add, then simplify.

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Sir what would be the answer of 2/8 + 2/9 ? The denominators are even and odd they haven't same multiples .. please sir

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Make a denominator to 72. Multiply by 9 to 2/8 and multiply by 8 to 2/9 so 18/72+ 16/72=34/72

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You can also do it by finding the LCM of the denominators.

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I think LCM and LCD are the same except that LCM is more generally used and LCD is used with fractions, while adding fractions. Kids would have enjoyed your lesson, adding fractions. Even the adults could if they haven't done it earlier as I did it once. A story is to motivate A lesson is to teach An example is to inspire Time is to test.

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