What is the greatest common factor of 91 and 42?

Answer 1

First Number: 52
Second Number: 91
Third Number: 104
The Greatest Common Factor (GCF) is: 13
Example Simplified Fraction: 52/91 => 4/7 (4 times 13 =52; 7 times 13=91; 104 divided by 13=8)

The Greatest Common Factor of 30, 75, 90 = 15
Example Simplified Fraction: 30/75 => 2/5

The Greatest Common Factor (GCF) is 2 for 118 and 116.
Example Simplified Fraction: 118/116 => 59/58

It is a common factor if it is a factor of two or more numbers - it is then "common to" those numbers. Example: for 12 and 30, the factors for 12 are 1, 2, 3, 4, 6 and 12.
The factors of 30 are 1, 2, 3, 5, 6, 10, 15 and 30
1,2,3 and 6 appear in both lists. So, the common factors of 12 and 30 are: 1, 2, 3 and 6. The "Greatest Common Factor" is merely the largest of the common factors (so 6 would be the greatest common factor for 12 and 30).

Finding the Greatest Common Factor:
Choose 2 numbers (ex. 9 and 18).
9's factors: 9: 1,3,9
18's factors: 1,2,3,6,9,18
1, 3, 9 are common; 9 is the greatest common factor.

Using the GCF Tool, the greatest number of identical snacks from the numbers 63 and 105 is 21 (Example Simplified Fraction: 63/105 => 3/5): 21 times 3= 63; 21 times 5=105.

so the gcf is 13

Answer 2

The greatest common factor (GCF) is often also called the greatest common divisor (GCD) or highest common factor (HCF). Keep in mind that these different terms all refer to the same thing: the largest integer which evenly divides two or more numbers.

The greatest common factor of 91 and 104 is 13
13

Answer 3

The factors of 4: 1, 2, 4

The factors of 51: 1, 3, 7, 51

GCF=1

Answer 4

The greatest common factor of 51 and 100 is 1.

Answer 5

The GCF is 7.

Answer 6

The GCF of 91 and 104 is 13.

Answer 7

Greatest common factor of 91 and 42 is 7.

Answer 8

1