OK, let's crack this. We're given 724 and our task is to multiply it by 9. Essentially, we'll be adding 724 to itself 9 times.
Step 1: 0 + 724 = 724
Step 2: 724 + 724 = 1448
Step 3: 1448 + 724 = 2172
Step 4: 2172 + 724 = 2896
Step 5: 2896 + 724 = 3620
Step 6: 3620 + 724 = 4344
Step 7: 4344 + 724 = 5068
Step 8: 5068 + 724 = 5792
Step 9: 5792 + 724 = 6516

So, 724*9 = 6516