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Because if there's no common denominator it'll be hard to simplify. And will cause you to get a headache.

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8y ago

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Before adding or subtracting Why are fractions turned into like fractions?

They have to have the same denominator.


What did you learn from adding and subtracting fractions?

I learned to always change the denominators before adding or subtracting the numerators. You must always have a common denominator before adding or subtracting.


Why do fractions need a common denominator before you add or subtract?

Because the answers will be wrong when adding or subtracting them if they don't have a common denominator.


What are the Rules of adding and subtracting dissimilar fractions?

If their denominators are different then find their lowest common denominator by means of their lowest common multiple remembering to adjust their numerators accordingly before adding or subtracting.


Before adding or subtracting two fractions they are converted into like fractions Explain with examples why this is necessary?

Before adding or subtracting two fractions they are converted into like fractions. Explain with examples why this is necessary.


How do subtract two fractions with different denominator?

First find the lowest common denominator and then adjust the fractions accordingly before subtracting the numerators


What do you do to a fraction before adding subtracting or dividing?

When adding or subtracting, convert all fractions in the question to a common denominator/ 1/2 + 1/4 - 1/3 = 6/12 + 3/12 - 4/12 = 5/12


What must you do first before adding or subtracting unlike fractions?

you must make the fractions equivalent and with the same denomenator


What is halfway between 1 over 4 and 1 over 2?

Just add the fractions, and divide by 2. Before adding, you have to convert to a common denominator; in this case, you can use "4" as the common denominator.Just add the fractions, and divide by 2. Before adding, you have to convert to a common denominator; in this case, you can use "4" as the common denominator.Just add the fractions, and divide by 2. Before adding, you have to convert to a common denominator; in this case, you can use "4" as the common denominator.Just add the fractions, and divide by 2. Before adding, you have to convert to a common denominator; in this case, you can use "4" as the common denominator.


Meaning of adding of dissimilar fractions?

Adding dissimilar fractions involves finding a common denominator for the fractions before adding them together. This common denominator is the least common multiple of the denominators of the fractions being added. Once the fractions have the same denominator, you can add the numerators together while keeping the denominator the same. Finally, simplify the resulting fraction if possible by reducing it to its simplest form.


What must a mathematician do before adding two unlike fractions?

Find the lowest common denominator


How do you get a common denominator for subtracting fractions?

you gotta find tyhe width of they nile river and substiture into the cosine rule before dividing by the velocity of the amazon rainforest