Let's roll up our sleeves and solve this. We have 126 and we're going to multiply it by 7, essentially adding 126 to itself 7 times.
Step 1: 0 + 126 = 126
Step 2: 126 + 126 = 252
Step 3: 252 + 126 = 378
Step 4: 378 + 126 = 504
Step 5: 504 + 126 = 630
Step 6: 630 + 126 = 756
Step 7: 756 + 126 = 882

So, 126*7 = 882