Alright, let's solve this math problem step by step. First, we have the number 839. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 4. So, we're going to take the number 839 and add it to itself 4 times.
Step 1: 0 + 839 = 839
Step 2: 839 + 839 = 1678
Step 3: 1678 + 839 = 2517
Step 4: 2517 + 839 = 3356

So, 839*4 = 3356