OK, let's work through this together. We're starting with 923 and we're going to multiply it by 4, which means we add 923 to itself 4 times.
Step 1: 0 + 923 = 923
Step 2: 923 + 923 = 1846
Step 3: 1846 + 923 = 2769
Step 4: 2769 + 923 = 3692

So, 923*4 = 3692