OK, let's work through this together. We're starting with 775 and we're going to multiply it by 4, which means we add 775 to itself 4 times.
Step 1: 0 + 775 = 775
Step 2: 775 + 775 = 1550
Step 3: 1550 + 775 = 2325
Step 4: 2325 + 775 = 3100

So, 775*4 = 3100