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# Do you find the GCF or LCM when adding fractions?

Updated: 11/1/2022

Wiki User

11y ago

When adding fractions, you want to make sure that the denominators are the same. It's the same process as the LCM.

Wiki User

11y ago

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Q: Do you find the GCF or LCM when adding fractions?
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### What problems can be solved using gcf and LCM?

Finding the LCM will make adding and subtracting fractions easier.

### When would you apply gcf instead of lcm?

GCF is used for factoring terms, possibly in solving equations. LCM is used to find a common denominator when adding or subtracting fractions.

### Why is greatest common factor in math helpful?

Finding the GCF helps to reduce fractions to their simplest form. Knowing the GCF can help to find the LCM, which assists in adding and subtracting fractions.

### When is it useful to find the LCM or GCF of two numbers to solve a problem?

When adding or subtracting fractions with different denominators and when reducing fractions to their lowest termsWhen adding or subtracting fractions with different denominators their lowest common multiple is needed and when reducing fractions to their lowest terms their greatest common factor is needed.

### When can you use common multiples and factors?

Use the LCM when you are adding and subtracting unlike fractions. Use the GCF when you are simplifying 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.

### What types of problems can be solved using the greatest common factor and what types of problems can be solved using the least common multiple.?

Finding the GCF will help in simplifying fractions. Finding the LCM will help in adding and subtracting fractions.

### Why do you find the LCM of numbers?

Finding the LCM helps in the process of adding and subtracting unlike fractions.

### How can the greatest common factor and least common multiple help you work with fractions?

Finding the GCF of the numerator and the denominator of a fraction and dividing them both by it will give you the simplest form of that fraction. Finding the LCM of unlike denominators and converting them to it will make it possible to add and subtract unlike fractions.

### How do GCF and LCM involve with the real world?

Use the GCF to reduce fractions. Use the LCM to add and subtract unlike fractions. Carpenters work with fractions a lot.

### What is the use of LCM?

When adding or subtracting unlike fractions, the LCM process is used to find the least common denominator.

### 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.