All of the odd numbers between 11 and 99 inclusive are two digit numbers that are not multiples of 2. There are 45 of them.
There are 30 two-digit multiples of 3 plus 18 two-digit multiples of 5 minus 6 two-digit multiples of both. Answer: 42
60 numbers
81 of them.
81
4500 of them.
198 of them.
45 multiples of 2 plus 30 multiples of 3 minus 15 multiples of 6 equals 60 numbers
Four. They are 14, 21, 28, and 42.
70 and 90
there aren't any as otherwise they wouldn't be prime numbers
There are 21 two-digit prime numbers.
no it is a prime number (prime means its multiples are only 1 and itself composite numbers can have multiples of many other things)