12, 15 and 20.
60
The GCF is 3.
Only the number one (1) does.
Because 3 is the largest number that divides into both 12 and 15 evenly with no remainder.
No. 15 is not evenly divisible by 12.
Any multiple of 420.
The LCM of 8, 12 and 15 is 120 because 120 is the smallest whole number that 8, 12 and 15 will all divide into evenly with no remainder.
15 is the highest number 15 can be divided by evenly.
3, 6, 9, 12, 15, 18, 21
1, 3, 5, 15.
1, 3, 5 and 15.
1 and 3.