Idon't now what this is can any one me

Forma The first numbers The common factores are 1 and 2 and forma the ladt numbers is 1,2,3, and 6 !!¡!

So for the first one, you'll need to write out all the factors of both 30 and 16.
(30--1, 2, 3, 5, 6, 10, 15, 30)
(16--1, 2, 4, 8, 16)
The biggest number that goes into both 30 and 16 is 2.

For the second kne, its the same thing.
(48--1, 2, 3, 4, 6, 8, 12, 16, 24, 48)
(18--1, 2, 3, 6, 9, 18)
The biggest number that can go into both 48 and 18 is 6.

Hope this all helps!!