They are: 1 and 3
45:1,5,9,42 42:1,2,6,7,21,42
The factors of 25 are: 1, 5, 25 The factors of 42 are: 1, 2, 3, 6, 7, 14, 21, 42 The factors of 45 are: 1, 3, 5, 9, 15, 45
The common factors of 42 and 273 are 1, 3, 7 and 21.
The common factors of 22 and 42 are: 1 and 2
The common factors of 42 and 77 are: 1 and 7
The common factors of 42 and 92 are: 1 and 2
The Common Factors of 42 and 44 are 1, 2
The common factors of 35 and 45 are: 1 and 5
The common factors of 21 42 and 84 are 21
The common factors of 42 and 44 are 1 and 2.
3 is the GCF of 42 and 45
Method to find common factors: Step 1: Find the difference between the two numbers. 52 - 42 = 10. Step 2: Find the factors of the difference so obtained. Factors of 10 are 1, 2, 5 and 10. Step 3: Check with only factors. 1 is factor of every number so, 1 is one of the common factors. 42 and 52 both are even numbers so, 2 is also the common factor. Numbers ending with the digit either 5 or 0 are only divisible by 5. And the ones ending with only 0 are divisible by 10. Clearly 42 and 52 are not divisible by 5 and 10. So, the only common factors of 42 and 52 are 1 and 2.