The greatest common factor (GCF) of 49 and 42 is 7.
To find the GCF, we can look for the largest number that divides both numbers without leaving a remainder. Let’s break down the factors:
- The factors of 49 are 1, 7, and 49.
- The factors of 42 are 1, 2, 3, 6, 7, 14, 21, and 42.
From these factors, we can see that the largest number they share is 7. Therefore, the GCF of 49 and 42 is 7.