least common multiple of 5 and 15
The least common multiple of 5 and 15 is 15.
least common multiple of 10 and 12
To find the least common multiple of 10 and 12, we can list out the multiples of each number and then find the smallest multiple that they have in common.
Multiples of 10: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120...
Multiples of 12: 12, 24, 36, 48, 60, 72, 84, 96, 108, 120...
The smallest multiple that 10 and 12 have in common is 60. Therefore, the least common multiple of 10 and 12 is 60.
least common multiple of 18
The least common multiple of 18 is 18, since 18 is the only multiple of 18 itself.
multiples of 2 and 6
Multiples of 2: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30...
Multiples of 6: 6, 12, 18, 24, 30, 36, 42, 48, 54, 60, 66, 72, 78, 84, 90...
The multiples that are common to both 2 and 6 are 6, 12, 18, 24, 30, 36, 42, 48, 54, 60...