Sure thing, let's get straight to it. We start with 939 and we're going to multiply it by 3, which means adding 939 to itself 3 times.
Step 1: 0 + 939 = 939
Step 2: 939 + 939 = 1878
Step 3: 1878 + 939 = 2817

So, 939*3 = 2817