Let's get this math done. We have 553 and we're going to multiply it by 7. This is the same as taking 553 and adding it to itself 7 times.
Step 1: 0 + 553 = 553
Step 2: 553 + 553 = 1106
Step 3: 1106 + 553 = 1659
Step 4: 1659 + 553 = 2212
Step 5: 2212 + 553 = 2765
Step 6: 2765 + 553 = 3318
Step 7: 3318 + 553 = 3871

So, 553*7 = 3871