Without delay, let's solve this. We've got 654 and we will be multiplying it by 7, that is, adding 654 to itself 7 times.
Step 1: 0 + 654 = 654
Step 2: 654 + 654 = 1308
Step 3: 1308 + 654 = 1962
Step 4: 1962 + 654 = 2616
Step 5: 2616 + 654 = 3270
Step 6: 3270 + 654 = 3924
Step 7: 3924 + 654 = 4578

So, 654*7 = 4578