The smallest number they can go into is 12.
84
4
60
The smallest number in which 2, 3, 4, and 5 go into is 60.
Smallest number is 12
Factors of the number will also be factors of the number's multiples. Multiples of the number will also be multiples of the number's factors.
60
12
The number is 66
60 ( 4 ) X 15 = 60 ( 3 ) X 20 = 60 ( 2 ) X 30 = 60 ( 5 ) X 12 = 60
8