To find a number that is a factor of both 36 and 49, we need to find the common factors of the two numbers. The factors of 36 are 1, 2, 3, 4, 6, 9, 12, 18, and 36, while the factors of 49 are 1, 7, and 49. The only factor that is common to both numbers is 1. Thus, 1 is a number that is a factor of both 36 and 49.
