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What is the connection between the LCM and adding or subtracting fractions?
Wiki User
∙ 14y ago
Two fractions having different denominators cannot be added or subtracted directly. They need to be converted to equivalent fractions having the same denominator to enable the addition or subtraction to take place. It is possible to use the product of the denominators of the original fractions as the common denominator but it simplifies the mathematics if the lowest common multiple of the two denominators is used.
EXAMPLE : Add 2/5 and 3/7. The lowest common denominator (also the LCM) of 5 and 7 is 35.
2/5 is equivalent to 2 x 7/5 x 7 = 14/35 : 3/7 is equivalent to 3 x 5/7 x 5 = 15/35
2/5 + 3/7 = 14/35 + 15/35 = 29/35
Wiki User
∙ 14y ago
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How are adding and subtracting fractions similar?
Subtracting a fraction is the same as adding its negative.
What are the rules for adding fractions?
Ensure that the denominators are the same when adding or subtracting fractions.
How are adding fractions different?
When adding or subtracting fractions their denominators must be the same
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.
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.
What is the definition of adding and subtracting fractions with unlike denominators?
What is the definition of Adding and Subtracting Like Fractions
How are adding and subtracting fractions similar?
Subtracting a fraction is the same as adding its negative.
What types of problems can be solved using the the LCM?
Anything having to do with adding or subtracting unlike fractions.
What are the rules for adding fractions?
Ensure that the denominators are the same when adding or subtracting fractions.
How are adding fractions different?
When adding or subtracting fractions their denominators must be the same
Who invented adding and subtracting fractions?
Me
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.
Adding and subtracting fractions?
Pulled and mulled
What are the rules for adding subtracting multiplying and dividing fractions?
no answer
When adding or subtracting fractions you must get a?
A Common 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.
How is subtracting fractions like adding fractions?
You need a common denominator for both.
