What is the greatest common factor of 315 and 356?

To find the greatest common factor (GCF) of two numbers, you need to determine the largest number that divides evenly into both numbers. To find the GCF of 315 and 356, you can first find the prime factors of each number. The prime factors of 315 are 3, 3, 5, 7, and the prime factors of 356 are 2, 2, 89. To find the GCF, you then identify the common prime factors and multiply them together, which in this case is 1 (since there are no common prime factors between 315 and 356). Therefore, the GCF of 315 and 356 is 1.