# greatest common factor of 28 104 and 76

Jared Myracle, Ed.D. has experience in many different facets of education, including teaching and school administration. For example, common factors of 10 and 20 are 1, 2, 5 and 10, but the highest of those is 10; therefore, the greatest common factor of 10 and 20 is 10. For smaller numbers you can simply look at the factors or multiples for each number and find the greatest common multiple of them. For additional information see our Run Another Calculation. Play this very quick and fun video now! 95 1, 5, 19, 95. Then, separate the common prime factors of each number and make a list of the common prime factors. So the Greatest Common Factor of 12, 18, and 30 is 6. Greatest Common Factor (GCF) of two or three numbers. For example, for the set of numbers 18, 30 and 42 the How many methods are there to calculate the Highest Common Factor(HCF)?  Zwillinger, D. GCD of 35640 and 33264 is 2376, and it's found in just two steps instead of 15. Euclid's Algorithm Calculator. In this method, first and foremost, you need to list out the prime factors of each given integer. HCF also is known as GCF and GCD. If you want to explore more about the HCF, GCF, LCM, Prime Factorization, etc. 6. Greatest Common Factor Calculator. He has also served two years on the Tennessee Department of Education’s Common Core Leadership Council.

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Jared Myracle, Ed.D. has experience in many different facets of education, including teaching and school administration. lists: It is a common factor when it is a factor of two (or more) numbers. But if you need to do the factorization by hand it will be a lot of work. Find if 4 is a factor of both 76 and 48. In this particular case, it is clear that the GCF would also be 2, yielding the result of GCF(268442, 178296, 66888) = 2. lcm(a, gcf(b, c)) = gcf(lcm(a, b), lcm(a, c)). In this article, . This method is a far more efficient method than the use of prime factorization. Were committed to providing the world with free how-to resources, and even \$1 helps us in our mission. In general, they can be both positive and negative, e.g. The GCF of 21 x 3, 9 x 2 and 15 x is 3 x. If b * c / a is an integer and gcf(a, b) = d, then a * c / d is also an integer. HCF Calculator: Finding the Highest Common Factor is similar to the Greatest common factor or divisor as HCF is also known as GCF or GCD. 50 = 10 5. Then, compare the list of factors to find the largest number that the two have in common. The biggest common factor number is the GCF number. X 76 Go. Once the remainder is 0, the GCF is the remainder from the step preceding the zero result. GCF by prime factorization, list out all of the prime factors of each number or find them with a The prime factorization of 120 is 2 x 2 x 2 x 3 x 5 = 120. GCF of 42, 42, 76, and 28 = 2. So the largest number we can divide both 12 and 30 exactly by is 6, like this: The Greatest Common Factor of 12 and 30 is 6. This article has been viewed 366,496 times. Enter 2 or more whole numbers separated by commas or spaces. It depends upon your knowledge of your students. 16 = 2 2 2 2. Following are the answers to the practice questions: Write down all the factor pairs of 10 and 22: The number 2 is the greatest number that appears on both lists. For instance, let us find the gcf(76, 104). So, check out the steps to calculate the HCF of given numbers by prime factorization here: Let's check the closer look of finding the HCF of numbers by Prime factorization with the help of show work given below. Finding the GCF is helpful when you want to reduce a fraction to its lowest terms.

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You can find the GCF in two ways. Help With Fractions: The algorithm is as follows: From the example above, it can be seen that GCF(268442, 178296) = 2. liigh Lu-L; VOL. Decompose the three numbers into their prime factors and underline every factor thats common to all three: The only factor common to all three numbers is 5. Procedure to Find the Highest Common Factor of Given Numbers. Further, find the products of the multiplicands in different orders to obtain the composite factors of the number. GCF is often used to find common denominators. Greatest Common Factor. Practice Questions. Hence, the greatest common factor of 18 and . All Rights Reserved. GCF calculator shown above. Given two whole numbers, subtract the smaller number from the larger number and note the result. Once we get the numbers down to the prime factorization, we look for the smallest power of each factor, as opposed to the largest power. The Greatest Common Factor definition is the largest integer factor that is present between a set of numbers. The procedure to find the HCF of number by division method is as follows: Find the HCF of 30 and 42 using the Division method? 2006 - 2023 CalculatorSoup Often in math problems, it can be desirable to find the greatest common factor of some given numbers. Dummies has always stood for taking on complex concepts and making them easy to understand. ? Include the highest number of occurrences of each prime factor that is common to each original number. The largest of the common factors is 27, so you can say that 27 is the greatest common factor of 27, 54, and 81. To find the Make use of the HCF Calculator provided here and calculate the highest common factor for the given numbers. New York, NY: CRC Press, 2003 p. 101. Volume to (Weight) Mass Converter for Recipes, Weight (Mass) to Volume to Converter for Recipes. Although it's quite complicated, the overall result is about 61%. If you found this content useful in your research, please do us a great favor and use the tool below to make sure you properly reference us wherever you use it. Lets try something more challenging. Greatest Common Factor Calculator. 291 TELEPH O NE 332-4601 SALEM. Enjoy! Underline the factors that all the original numbers have in common. The factors of 104 are 1, 2, 4, 8, 13, 26, 52 and 104. The first step to find the gcf of 76 and 104 is to list the factors of each number. Say we have worked out the factors of two numbers: Then the common factors are those that are found in both You don't have to know prime factorization to find the greatest common factor.  2. 30 = 10 3. Solution: We have to list the factors of 95 and 76. Find factors of the number. So the greatest common factor of 18 and 27 is 3 x 3 = 9. Multiply the factors. Therefore, the contents of this site are not suitable for any use involving risk to health, finances or property. This method is somewhat related to the one previously mentioned. It can also be referred to as a common divisor. The factors of 20 are 1, 2, 4, 5, 10, 20. 88 = 2 2 2 11. From The GCF is also known as the Highest Common Factor (HCF) Let us consider the example given below: For example - The GCF of 18, 21 is 3. As you have seen in the previous example, the common factors of 12, 18, and 30 are 1, 2, 3, 5, and 6. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. The GCF calculator evaluates the Greatest Common Factor between two to six different numbers. Now that we are aware of numerous methods of finding the Greatest Common Divisor of two numbers, you might ask: "how to find the Greatest Common Factor of three or more numbers?". We can also find the greatest common factor of three numbers or more by this method. "Greatest Common Factor of 76, 28, and 104". Evaluate the factors of 76 and write them in descending order. The greatest common factor of the numbers : Work. A factor is a term in multiplication. The highest number that exactly divides the given numbers with Zero Remainder is called the Highest Common Factor (HCF). Determine the factors for 104 up to 104 since that is the minimum of the 2 numbers. The consent submitted will only be used for data processing originating from this website. wikiHow is a wiki, similar to Wikipedia, which means that many of our articles are co-written by multiple authors. In the second step, the divisor becomes the new dividend, now divide the dividend number by divisor. Put simply, the GCF of a set of whole numbers is the largest positive integer (i.e whole number and not a decimal) that divides evenly into all of the numbers in the set. Otherwise, you cound find an infinite combination of distinct fractions being factors, which is pointless in our case. separated by commas or spaces. Toggle sidebar Rosetta Code. One of these involves computing the prime factorizations of each integer, determining which factors they have in common, and multiplying these factors to find the GCD. Write down all the factor pairs of 12 and 20: Factor pairs of 20: 1 x 20, 2 x 10, 4 x 5. Find the Highest common factor of 40 and 60 by prime factorization? Hopefully you've learned a little math today and understand how to calculate the GCD of numbers. Thus, the Highest Common Factor of 40 and 60 is 20. And The prime factorization of 20 is 2 x 2 x 5 = 20. 72 = 2 x 2 x 2 x 3 x 3. Let's take a look at our examples one more time - numbers 40 and 72. How do you solve the Highest Common Factor of Numbers using a calculator? Research source This is important in certain applications of mathematics such as simplifying polynomials where often it's essential to pull out common factors. References. GCF of 2 numbers and using the result along with the next number to find the wikiHow is where trusted research and expert knowledge come together. Also, it gives detailed procedures along with show work. Heres how to find the GCF:

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1. Decompose the numbers into their prime factors.

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3. Underline the factors that all the original numbers have in common.

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5. Multiply the underlined numbers to get the GCF.

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## Sample questions

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1. Find the greatest common factor of 12 and 20.

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4. Write down all the factor pairs of 12 and 20:

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Factor pairs of 12: 1 x 12, 2 x 6, 3 x 4

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Factor pairs of 20: 1 x 20, 2 x 10, 4 x 5

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The number 4 is the greatest number that appears in both lists of factor pairs, so its the GCF.

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3. Find the greatest common factor of 24, 36, and 42.

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6. Decompose all three numbers down to their prime factors:

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24 = 2 x 2 x 2 x 3

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36 = 2 x 2 x 3 x 3

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42 = 2 x 3 x 7

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Underline all factors that are common to all three numbers:

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24 = 2 x 2 x 2 x 3

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36 = 2 x 2 x 3 x 3

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42 = 2 x 3 x 7

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2 x 3 = 6

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## Practice questions

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1. Find the greatest common factor of 10 and 22.

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3. Whats the GCF of 8 and 32?

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5. Find the GCF of 30 and 45.

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7. Figure out the GCF of 27 and 72.

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9. Find the GCF of 15, 20, and 35.

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11. Figure out the GCF of 44, 56, and 72.

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Following are the answers to the practice questions:

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1. The GCF of 10 and 22 is 2.

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Write down all the factor pairs of 10 and 22:

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10: 1 x 10, 2 x 5

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22: 1 x 22, 2 x 11

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The number 2 is the greatest number that appears on both lists.

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3. The GCF of 8 and 32 is 8.

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Write down all the factor pairs of 8 and 32:

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8: 1 x 8, 2 x 4

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32: 1 x 32, 2 x 16, 4 x 8

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The greatest number that appears on both lists is 8.

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5. The GCF of 30 and 45 is 15.

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Write down all the factor pairs of 30 and 45:

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30: 1 x 30, 2 x 15, 3 x 10, 5 x 6

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45: 1 x 45, 3 x 15, 5 x 9

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The greatest number that appears on both lists is 15.

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7. The GCF of 27 and 72 is 9.

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Decompose 27 and 72 into their prime factors and underline every factor thats common to both:

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27 = 3 x 3 x 3

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72 = 2 x 2 x 2 x 3 x 3

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Multiply those underlined numbers to get your answer: 3 x 3 = 9.

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9. The GCF of 15, 20, and 35 is 5.

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Decompose the three numbers into their prime factors and underline every factor thats common to all three:

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15 = 3 x 5

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20 = 2 x 2 x 5

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35 = 5 x 7

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The only factor common to all three numbers is 5.

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11. The GCF of 44, 56, and 72 is 4.

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Decompose all three numbers to their prime factors and underline each factor thats common to all three:

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44 = 2 x 2 x 11

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56 = 2 x 2 x 2 x 7

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72 = 2 x 2 x 2 x 3 x 3

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Multiply those underlined numbers to get your answer: 2 x 2 = 4.

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","blurb":"","authors":[{"authorId":9399,"name":"Mark Zegarelli","slug":"mark-zegarelli","description":" Mark Zegarelli is a professional writer with degrees in both English and Math from Rutgers University. It can also be referred to as a common divisor. They have 3 and 7 in common. Thanks to all authors for creating a page that has been read 366,496 times. The whole number factors are numbers that divide evenly into the number with zero remainder. The Answer. List the prime factors that are common to each of the original numbers. All Prime Factors of 76 : 2, 2, 19. Moreover, only integers are concerned. Type up to 15 numbers in the text boxes below then hit 'calculate'. Free online Calculator that shows all the work. Just enter in the numerator and the denominator of any fraction you like . greatest common factor (GCF). The common factors of 18 and 27 are 1, 3 and 9. To find the Least Common Multiple, we use much of same process we used to find the GCF. What is the Greatest Common Factor? In order to find the greatest common factor of two numbers, you'll need to factor out both of those numbers using your knowledge of timetables, then identify the largest number that appears in both sets of factors. Along the way, he’s also paid a few bills doing housecleaning, decorative painting, and (for ten hours) retail sales. The greatest is 4. OK, there is also a really easy method: we can use the Greatest Common Factor Calculator to find it automatically. What is the GCF of 33264and 35640? 2 * 3 is the same as (-2) * (-3), both equal 6. EX: GCF (16, 88, 104) 16 = 2 2 2 2. The idea which is the basis of the Euclidean algorithm says that if the number k is the Greatest Common Factor of numbers A and B, then k is also GCF for the difference of these numbers A - B. Common factors are factors (divisors) that are in common among a set of numbers. In this section, we list the most important ones: If the ratio of two numbers a and b (a > b) is an integer then gcf(a, b) = b. gcf(a, 0) = a, used in Euclidean algorithm. There are multiple ways to find the greatest common factor of given integers. The first option is to list all the factor pairs of the numbers and choose the largest factor that appears in both (or all) the lists. Each of the numbers can be divided by 1, 3, 9, and 27, so you can say that these numbers are common factors of the set of numbers 27, 54, and 81. In our previous example, the largest of the common factors is 15, so the Greatest Common Factor of 15, 30 and 105 is 15, The "Greatest Common Factor" is the largest of the common factors (of two or more numbers).

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