OK, let's work through this together. We're starting with 786 and we're going to multiply it by 5, which means we add 786 to itself 5 times.
Step 1: 0 + 786 = 786
Step 2: 786 + 786 = 1572
Step 3: 1572 + 786 = 2358
Step 4: 2358 + 786 = 3144
Step 5: 3144 + 786 = 3930

So, 786*5 = 3930