Let \(A = \{1, 2, 3\}\) and \(B = \{1, 2, 3, 4, 5\}\) be two sets of numbers. Is set \(A\) a subset of set \(B\)?

Step 1 ：Step 1: We know that set \(A\) is a subset of set \(B\) if every element of \(A\) is also an element of \(B\).

Step 2 ：Step 2: Check every element in set \(A\), which are \(1\), \(2\), and \(3\), to see if they are in set \(B\).

Step 3 ：Step 3: We see that \(1\), \(2\), and \(3\) are all in set \(B\).