OK, let's work through this together. We're starting with 79 and we're going to multiply it by 4, which means we add 79 to itself 4 times.
Step 1: 0 + 79 = 79
Step 2: 79 + 79 = 158
Step 3: 158 + 79 = 237
Step 4: 237 + 79 = 316

So, 79*4 = 316