Sure thing! We've got 544 and we're gonna multiply it by 15. That's the same as adding 544 to itself 15 times.
Step 1: 0 + 544 = 544
Step 2: 544 + 544 = 1088
Step 3: 1088 + 544 = 1632
Step 4: 1632 + 544 = 2176
Step 5: 2176 + 544 = 2720
Step 6: 2720 + 544 = 3264
Step 7: 3264 + 544 = 3808
Step 8: 3808 + 544 = 4352
Step 9: 4352 + 544 = 4896
Step 10: 4896 + 544 = 5440
Step 11: 5440 + 544 = 5984
Step 12: 5984 + 544 = 6528
Step 13: 6528 + 544 = 7072
Step 14: 7072 + 544 = 7616
Step 15: 7616 + 544 = 8160

So, 544*15 = 8160