Alright, let's solve this math problem step by step. First, we have the number 781. 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 781 and add it to itself 3 times.
Step 1: 0 + 781 = 781
Step 2: 781 + 781 = 1562
Step 3: 1562 + 781 = 2343

So, 781*3 = 2343