Let's roll up our sleeves and solve this. We have 858 and we're going to multiply it by 3, essentially 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