What is the GCF of 7 and 12?
Greatest Common Factor of 7 and 21 is the greatest possible number which divides both 7 and 12 exactly.
Answer: GCF of 7 and 12 is 1
Lets see how to find the GCF of 7 and 12
Explanation:
GCF of 7 and 12 by Prime Factorisation Method
Prime Factorisation of 7: 7
Prime Factorisation of 12: 2 × 2 × 3
We can see that there are no common factors .THerefore universal factor 1 is the GCF of 7 and 12
GCF of 7 and 12 by Long Division

Step 1: Divide the largest number 12 by the smaller number 7 and check the remainder. Here, the remainder is 5

Step 2: Make the remainder 5 as the divisor and the divisor 7 as the dividend and perform the long division again.

Step 3: Continue till you get the remainder as 0 and GCF of 7 and 12 is the last divisor obtained.
You can find the GCF of 7 and 12 in any of the above methods but the solution will be the same.