5, 10, 15, 20, 25, 30, 35, 40, 45, 50
Multiples of 50 are the only numbers that are both. All other multiples of 5 aren't.
what are the multiples of 50
Since 10 is a multiple of 5, all multiples of 10 will also be multiples of 5. Test the theory. 30, 50, 100... All multiples of 10, and also of 5.
35 and 70 both have 7 and 5 as prime factors
There are three numbers between 10 and 50 which are divisible by both 3 and 5. All numbers that are multiples of 3 and 5 are the multiples of the lowest common multiples (lcm) of 3 and 5 which is 15. The multiples of 15 between 10 and 50 are {15, 30 and 45}, thus there are 3 numbers.
56, 63, 70 and 77
The factors are 1, 2, 5, 10, 25, and 50. There are an infinite number of multiples starting with 50, 100, 150, 200, 250, 300, etc.
45, 50, 55
5, 10, 25, 50
5, 10, 25, 50
50 is a factor of all the multiples of 50: 50, 100, 150, 200, etc.
50, 100, 150, 200, 250