Sure thing, let's get straight to it. We start with 858 and we're going to multiply it by 3, which means adding 858 to itself 3 times.
Step 1: 0 + 858 = 858
Step 2: 858 + 858 = 1716
Step 3: 1716 + 858 = 2574

So, 858*3 = 2574