Alright, let's solve this math problem step by step. First, we have the number 636. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 7. So, we're going to take the number 636 and add it to itself 7 times.
Step 1: 0 + 636 = 636
Step 2: 636 + 636 = 1272
Step 3: 1272 + 636 = 1908
Step 4: 1908 + 636 = 2544
Step 5: 2544 + 636 = 3180
Step 6: 3180 + 636 = 3816
Step 7: 3816 + 636 = 4452

So, 636*7 = 4452