Alright, let's solve this math problem step by step. First, we have the number 810. 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 810 and add it to itself 3 times.
Step 1: 0 + 810 = 810
Step 2: 810 + 810 = 1620
Step 3: 1620 + 810 = 2430

So, 810*3 = 2430