Sure thing, let's get straight to it. We start with 769 and we're going to multiply it by 15, which means adding 769 to itself 15 times.
Step 1: 0 + 769 = 769
Step 2: 769 + 769 = 1538
Step 3: 1538 + 769 = 2307
Step 4: 2307 + 769 = 3076
Step 5: 3076 + 769 = 3845
Step 6: 3845 + 769 = 4614
Step 7: 4614 + 769 = 5383
Step 8: 5383 + 769 = 6152
Step 9: 6152 + 769 = 6921
Step 10: 6921 + 769 = 7690
Step 11: 7690 + 769 = 8459
Step 12: 8459 + 769 = 9228
Step 13: 9228 + 769 = 9997
Step 14: 9997 + 769 = 10766
Step 15: 10766 + 769 = 11535

So, 769*15 = 11535