OK, let's work through this together. We're starting with 127 and we're going to multiply it by 15, which means we add 127 to itself 15 times.
Step 1: 0 + 127 = 127
Step 2: 127 + 127 = 254
Step 3: 254 + 127 = 381
Step 4: 381 + 127 = 508
Step 5: 508 + 127 = 635
Step 6: 635 + 127 = 762
Step 7: 762 + 127 = 889
Step 8: 889 + 127 = 1016
Step 9: 1016 + 127 = 1143
Step 10: 1143 + 127 = 1270
Step 11: 1270 + 127 = 1397
Step 12: 1397 + 127 = 1524
Step 13: 1524 + 127 = 1651
Step 14: 1651 + 127 = 1778
Step 15: 1778 + 127 = 1905

So, 127*15 = 1905