OK, let's work through this together. We're starting with 526 and we're going to multiply it by 3, which means we add 526 to itself 3 times.
Step 1: 0 + 526 = 526
Step 2: 526 + 526 = 1052
Step 3: 1052 + 526 = 1578

So, 526*3 = 1578