Let's get this math done. We have 880 and we're going to multiply it by 4. This is the same as taking 880 and adding it to itself 4 times.
Step 1: 0 + 880 = 880
Step 2: 880 + 880 = 1760
Step 3: 1760 + 880 = 2640
Step 4: 2640 + 880 = 3520

So, 880*4 = 3520