Let's get this math done. We have 342 and we're going to multiply it by 3. This is the same as taking 342 and adding it to itself 3 times.
Step 1: 0 + 342 = 342
Step 2: 342 + 342 = 684
Step 3: 684 + 342 = 1026

So, 342*3 = 1026