675, 690, 705.
They are multiples of 60.
15.15
30, 60, 90
15, 30, and 45 are.
No.
50, 75, 100.
The two common multiples of three and five are: 15 and 30 ^-^
30
The LCM is: 30
First of all unless you go into decimals, there are only three multiples of 9 and they are 1,3,and 9.
20, 40, 60.
30, 60, 90