What are 30 and 36s common multiple?

Answer 1

it is quite easy actually...

30, 36 divided by a random number (in this case I use number 6 as it can divide both numbers without leaving any decimals) =5, 6

as 5, 6 cannot be divided any further by any same number, you multiply the remaining number (5 & 6) with the number you used to divide 30 & 36

6x5x6= 180

Check: 180/36= 5

180/30= 6

multiple of 36: 36, 72, 108, 144, 180...

multiple of 30: 30, 60, 90, 120, 150, 180...

So, the lowest common multiple of 30 and 36 is 180.