Just 80
Including 101: 101, 103, 107, 109, 113, 127, 131, 137, 139, 149. There are 10.
That's a null set. All multiples of 10 are even.
Numbers from 0 to 100 that are multiples of 10 are: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100. That's ten numbers, so the fraction of numbers from 1 to 100 that are multiples of 10 is 10/100. In simplest form it is 1/10.
Numbers which are the factors of thirty and multiples of five are 5, 10, 15 and 30.
The numbers that are between 55 and 101 that are also multiples of 3, 10 and 15 are: 60, 75 and 90.
80.
Just 80
There are no numbers between 67 and 113 which are multiples of 65.
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.
60 and 90
Multiples of 10 cannot be prime.
33 multiples of 3 10 multiples of 10 -3 multiples of both 40 total
10, 20, 30, 40, 50, 60, 70, 80, 90, 100
Just count the multiples of 6...
It is 80
Any multiple of 10 is also a multiple of 5, so all you need to do is find the multiples of 10. Those are the numbers that end with zero.