12, 24, 36, 48, 60, 72, 84, 96
72.
All nonzero numbers have an infinite amount of multiples.
it is 44 and 88
50
Just 49
It's 72
21: 21, 42, 63, and 84!
There are 2 such numbers: 44, 88.
Just 72.
70 and 75
The common multiples of 8 and 12 that are less than 100 are 24, 40, 48, 56, 64, 72, 80, 88, and 96.
To find prime numbers less than 100, the sieve of eratosthenes filters out 1 and all multiples of 2, 3, 5, and 7. All remaining numbers less than 100 are primes.