Let's get this math done. We have 866 and we're going to multiply it by 3. This is the same as taking 866 and adding it to itself 3 times.
Step 1: 0 + 866 = 866
Step 2: 866 + 866 = 1732
Step 3: 1732 + 866 = 2598

So, 866*3 = 2598