Let's get this math done. We have 415 and we're going to multiply it by 3. This is the same as taking 415 and adding it to itself 3 times.
Step 1: 0 + 415 = 415
Step 2: 415 + 415 = 830
Step 3: 830 + 415 = 1245

So, 415*3 = 1245