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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.

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โˆ™ 2017-10-05 01:52:32
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Q: How can knowing the LCM help you add subtract and multiply fractions?
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How can knowing the gcf and lcm help you add subtract and multiply fractions?

Knowing the LCM of the denominators will help you to find a least common denominator of unlike fractions, which will allow you to add and subtract them successfully. Knowing the GCF and LCM will not help you in multiplying them, but knowing the GCF of the numerator and denominator of a fraction will help you reduce it if necessary.


How can knowing the greatest common factor and lowest common factor help when you add subtract and multiply fractions?

The least common factor of any set of numbers is 1, so that doesn't help at all. Finding the GCF of the numerator and denominator and dividing them by it will help to simplify a fraction. Finding the least common multiple of the denominators (called the least common denominator) will help when you add and subtract fractions. None of those are needed to multiply fractions.


How can knowing the GCF and LCM help you when you add subtract and multiply fractions?

Knowing the LCM will help when adding or subtracting unlike fractions. By finding the LCM of the denominators, (called the lowest common denominator) you can convert unlike to like fractions and proceed with the adding or subtracting. Knowing the GCF helps reduce a fraction. By finding the GCF of the numerator and the denominator and dividing both of them by it, you can reduce a fraction to its lowest terms (simplest form). If the GCF is 1, the fraction is in its simplest form. You can successfully multiply fractions without knowing the GCF or LCM.


How can knowing the GCF and LCM help you when you add subtract and multiply fraction?

Knowing the LCM of the denominators of unlike fractions will help you find the least common denominator, a necessary step in adding and subtracting them. Knowing the GCF of a numerator and denominator will tell you if the fraction can be reduced.


How can using the GCF and LMC help you you add subtract and multiply fractions?

To add and subtract unlike fractions, find the LCM of the denominators and convert them to equivalent like fractions. You don't have to do anything to fractions to multiply them, but you may need to reduce one after multiplying. To do that, find the GCF of the numerator and the denominator and divide both of them by it. If the GCF is 1, the fraction is in its simplest form.


How can knowing the greatest common factor and least common multiple help you when you add subtract and multiply fractions?

Knowing the least common multiple of the denominators will help you find a common denominator when adding and subtracting unlike fractions. Knowing the greatest common factor of the numerator and the denominator will help you reduce the fraction if possible.


What are the rules of the dissimilar fractions?

I assume you mean, with different denominators. If you want to add the fractions, subtract them, or compare them (determine which one is greater), you have to convert them to similar fractions (fractions with the same denominator) first. Converting to similar fractions is not necessary, and usually doesn't even help, if you want to multiply or divide fractions.


Why do you need HCF and LCM?

The LCM will help you add and subtract fractions. The GCF will help you simplify fractions.


Why you need LCM and HCF in maths?

The LCM will help you add and subtract fractions. The GCF will help you simplify fractions.


How does the LCM and the GCF help in life?

Finding the LCM will help you add and subtract fractions. Finding the GCF will help you reduce fractions.


How can using the GCF and LCM help you when you add subtract and multiply fractions?

When adding and subtracting unlike fractions, it is necessary to find a least common denominator. It's the same process as finding an LCM. You can simplify a fraction by finding the GCF of the numerator and denominator and dividing them both by it.


What good is math?

It will help you in life a ton! knowing how to add,multiply,subtract,and a lot of other math stuff will help you get good grads, get a good job, and help you know if your getting ripped off at a yard sale.


What equals 101?

Nothing equals 101 only if you multiply 1x101 or if you add or subtract. This may help you!


How do you use prime factorization to subtract fractions in math?

Finding the prime factorizations of the denominators will help you find the least common denominator. Converting to equivalent fractions with like denominators will allow you to subtract them successfully.


Why do you needto find the LCM?

Finding the LCM will help you when you need to add and subtract fractions.


Why should you find a LCM?

Finding an LCM will help when you want to add and subtract fractions.


Why is finding the least common multiple important?

It will help when you are trying to add and subtract fractions.


Why is it important to find the LCM of 2 numbers?

It will help when you want to add and subtract unlike fractions.


How does knowing factors help you simplify fractions?

Knowing factors will help you find a GCF. To simplify a fraction, divide the numerator and the denominator by their GCF.


How do you multiply fractions with whole numbers?

Fractions are multiplied by multiplying numerator by numerator and denominator by denominator. The fractions may be simplified before multiplying. Whole numbers have the understood denominator of 1. Read this lesson on multiplying fractions if you need help on how to multiply fractions.you multiply the denomanators and the top number then multiply the whole #s then reduce your answer if you can. an example would be 3 8/9X6 8/9= 18 64/81 get it now?


What is least common multiple or LCM?

The LCM is used to help you add or subtract fractions with different denominators.


How can you use a rectangular model to help multiply fractions?

You don't need any complicated "model". Just multiply the top parts of both fractions and put the answer in the top part of the result. Similarly, the bottom part of the result is the product of the bottom parts of both fractions.


How does multiplying fractions help solve math problems?

It depends on the specific problem. If you have an equation that involves fractions, quite often you'll need to multiply them.


Why find factor?

Finding factors is the first step in finding the GCF and the LCM. They will help you to reduce fractions, or add and subtract them.


When you multiply a fractions with the same denominator will the denominator be the same?

exactly you got it you dont need help :)