Let's get this math done. We have 722 and we're going to multiply it by 15. This is the same as taking 722 and adding it to itself 15 times.
Step 1: 0 + 722 = 722
Step 2: 722 + 722 = 1444
Step 3: 1444 + 722 = 2166
Step 4: 2166 + 722 = 2888
Step 5: 2888 + 722 = 3610
Step 6: 3610 + 722 = 4332
Step 7: 4332 + 722 = 5054
Step 8: 5054 + 722 = 5776
Step 9: 5776 + 722 = 6498
Step 10: 6498 + 722 = 7220
Step 11: 7220 + 722 = 7942
Step 12: 7942 + 722 = 8664
Step 13: 8664 + 722 = 9386
Step 14: 9386 + 722 = 10108
Step 15: 10108 + 722 = 10830

So, 722*15 = 10830