Sure thing, let's get straight to it. We start with 624 and we're going to multiply it by 3, which means adding 624 to itself 3 times.
Step 1: 0 + 624 = 624
Step 2: 624 + 624 = 1248
Step 3: 1248 + 624 = 1872

So, 624*3 = 1872