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Q: How are fact families related to adding and subtracting fractions?

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What is the definition of Adding and Subtracting Like Fractions

When adding or subtracting fractions their denominators must be the same

Me

Subtracting a fraction is the same as adding its negative.

Ensure that the denominators are the same when adding or subtracting fractions.

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

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

Pulled and mulled

You need a common denominator for both.

They have to have the same denominator.

To subtract fractions with like denominators, subtract the numerators , and write the difference over the denominator. Example : Find 45−25 . Since the denominators are the same, subtract the numerators.

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A Common Denominator

When adding and subtracting unlike fractions, find the LCM of the denominators and convert them to it. In this case, it's called the least common denominator, but it's the same process.

Subtracting a negative fraction is the same as adding its positive equivalent.

In order to find the LCD when adding or subtracting fractions

When you are adding and subtracting fractions.

Find a common denamonator.

a common denominator

When you are adding or subtracting fractions.

When you are adding or subtracting fractions.

When adding and subtracting unlike fractions, it is necessary to find the LCM of the denominators, called the least common denominator. Once you have found the LCD, you can convert the fractions to equivalent fractions with a common denominator and proceed with the adding and/or subtracting. Finding an LCM will have no effect on multiplying fractions.

When adding or subtracting fractions first make sure that the denominators are the same if they aren't then find the lowest common denominator and alter the fractions accordingly

The HCF helps when reducing fractions. The LCM helps when adding or subtracting fractions.

No, you only need a common denominator when adding or subtracting fractions.