Let's get this math done. We have 678 and we're going to multiply it by 7. This is the same as taking 678 and adding it to itself 7 times.
Step 1: 0 + 678 = 678
Step 2: 678 + 678 = 1356
Step 3: 1356 + 678 = 2034
Step 4: 2034 + 678 = 2712
Step 5: 2712 + 678 = 3390
Step 6: 3390 + 678 = 4068
Step 7: 4068 + 678 = 4746

So, 678*7 = 4746