Without delay, let's solve this. We've got 99 and we will be multiplying it by 7, that is, adding 99 to itself 7 times.
Step 1: 0 + 99 = 99
Step 2: 99 + 99 = 198
Step 3: 198 + 99 = 297
Step 4: 297 + 99 = 396
Step 5: 396 + 99 = 495
Step 6: 495 + 99 = 594
Step 7: 594 + 99 = 693

So, 99*7 = 693