Let's roll up our sleeves and solve this. We have 856 and we're going to multiply it by 3, essentially adding 856 to itself 3 times.
Step 1: 0 + 856 = 856
Step 2: 856 + 856 = 1712
Step 3: 1712 + 856 = 2568

So, 856*3 = 2568