Alright, let's solve this math problem step by step. First, we have the number 857. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 3. So, we're going to take the number 857 and add it to itself 3 times.
Step 1: 0 + 857 = 857
Step 2: 857 + 857 = 1714
Step 3: 1714 + 857 = 2571

So, 857*3 = 2571