Let's get this math done. We have 678 and we're going to multiply it by 3. This is the same as taking 678 and adding it to itself 3 times.
Step 1: 0 + 678 = 678
Step 2: 678 + 678 = 1356
Step 3: 1356 + 678 = 2034

So, 678*3 = 2034