Solve the following problems below. (GCF )Show your complete solution and answer.

A teacher wants to form small groups of 24 students on Monday and 42 students on Tuesday with the same number in each of the small groups. What is the largest small-group size possible?

Mark has 24 marbles while Alfonso has 30. Their mother would like to buy boxes where they can place their marbles. If they want to place the same number of marbles in each box without a marble left, how many boxes should their mother buy? ​