The greatest common factor of 3 and 40 is 1. There are no common factors between 3 and 40 aside from 1. This means that the GCF is 1.
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The greatest common factor of 36 and 40 is 4. One way to determine the greatest common factor is to find all the factors of the numbers and compare them. The factors of 36 are 1, 2, 3, 4, 6, 9, 12, 18, and 36. The factors of 40 are 1, 2, 4, 5, 8, 10, 20, and 40. The common factors are 1, 2, and 4. Therefore, the greatest common factor is 4. The greatest common factor can also be calculated by identifying the common prime factors and multiplying them together. The prime factors of 36 are 2, 2, 3, and 3. The prime factors of 40 are 2, 2, 2, and 5. The prime factors in common are 2 and 2, so the greatest common factor is 2 x 2 = 4.
The GCF of 40,15 is 515 = 3 x 540 = 2 x 2 x 2 x 5-----------------------------------------------------------------------------------------------------------Another way to see it, which may be easier for you to understand is:15 = 5 x 3 (5 is a factor and 3 is a factor)40 = 5 x 8 (5 is a factor and 8 is a factor)So the answer is 5, which is the largest number (greatest common factor) that will divide evenly into 40 and 15.The GCF is 5.
The GCF of 40 and 60 is 20 Additional Details The factors of 40 are 1, 2, 4, 5, 8, 10, 20, and 40. The factors of 60 are 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, and 60. The common factors are 1, 2, 4, 5, 10, and 20. Therefore, 20 is the greatest common factor. The greatest common factor can also be determined from the prime factors. The prime factors of 40 are 2, 2, 2, and 5. The prime factors of 60 are 2, 2, 3, and 5. The prime factors they have in common are 2, 2, and 5, so the greatest common factor is 2 x 2 x 5 = 20.
The greatest common factor of 3 6 and 84 is 3.
3 is a factor of 51, and 3 is also the largest factor of itself, so 3 is the greatest common factor. The factors of 3 are 1 and 3. The factors of 51 are 1, 3, 17, and 51. The common factors are 1 and 3. Therefore, the greatest common factor is 3. The greatest common factor can also be calculated by identifying the common prime factors and multiplying them together. The prime factor of 3 is 3. The prime factors of 51 are 3 and 17. The common prime factors are a single 3, so the greatest common factor is 3.