Since 13 is a Prime number, its only positive integer factors are itself and 1. Since the number 20 shares the common factor 1, the only common factor of the numbers is 1.
13 and 20 don't have common factors, so 13/20 can't be simplified any more.
Since they don't share any prime factors, multiply them. The LCM is 180.
Just 1.
Four common factors.
Any non-zero integer can be a factor. So 8 and 13.
The factors of 20 are 1, 2, 4, 5, 10, and 20. The factors of 65 are 1, 5, 13, and 65
1,2,5 & 10
Factors of 13: 1, 13Factors of 20: 1, 2, 4, 5, 10, 20GCF (13, 20) = 1
Just 1.
20: 1,2,4,5,10,20
Factors of 20:1,2,4,5,10,20Factors of 65:1,5,13,65The common factors are 1 and 5.
Any multiple of 20 includes the prime factors of 20.