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What way is subracting fractions with unlike denominators like adding fractions with unlike denominators?
If the denominators are not the same, then you have to use equivalent fractions which do have a common denominator . To do this, you need to find the least common multiple (LCM) of the two denominators.
How can you find a common denominator for two unlike fractions?
Find the lowest common multiple of the denominators and adjust the fractions accordingly
How do you subtract Fractions with models unlike denominators?
The denominators need to be the same for subtraction. Find the Least Common Denominator for both items and then subtract.
How do you find the common denominator of 3 fractions?
Pick two of the fractions and find the Least Common Multiple of those two denominators. Then take that number, and find the Least Common Multiple between that and the third denominator. This number will be the Least Common Denominator between the three fractions.If you don't care to find the Least common denominator, then just take the three denominators, and multiply them together.
Discuss the possible advantages and disadvantages of using least common denominators when adding and subtracting fractions?
By using least common denominators when adding and subtracting fraction you get small numbers which are easy to perform operations on. On the other hand if you deal with common denominators which are excessively large, then you will find that operations are harder to perform. The one disadvantage of using LCD is that they can occasionally be difficult to find.
