Greatest common factor of 9 30 and 42 is 3.
Any multiple of 126.
126, 252, 378
18 and 27
Any multiple of 126.
The greatest common factor (GCF) is 3.
Common Multiples are multiples which are common to both numbers So Multiples of 9 are 9, 18, 27, 36 etc... Multiples of 27 are 27, 54, 81 etc... you can work out the least common multiple as 27 We can see that 9 is a factor of 27 so all multiples of 27 are a common multiple with 9. But as there is no upper limit we can not work out a greatest common multiple as they bigger they get the closer they get to infinity! You tend to work out Greatest Common Factor and Least Common Multiple with regards numbers.
There are infinite amount of multiples of each. But a few are: 9: 9, 18, 27, 36, 45, 54, 63, 72, 80,... 42: 42, 84, 126, 168, 210, 252,... If you keep listing out the multiples of 9, you'll see the least common multiple of 9 and 42 is 126.
There can only be one greatest and the greatest common multiple of 9 and 10 is infinite. The first 5 common multiples of 9 and 10 are 90, 180, 270, 360 and 450.
126, 252, 378 and so on.
3 is the greatest common factor of 42 and 99.
The LCM is 18. The greatest common multiple is infinite.