OK, let's work through this together. We're starting with 44 and we're going to multiply it by 15, which means we add 44 to itself 15 times.
Step 1: 0 + 44 = 44
Step 2: 44 + 44 = 88
Step 3: 88 + 44 = 132
Step 4: 132 + 44 = 176
Step 5: 176 + 44 = 220
Step 6: 220 + 44 = 264
Step 7: 264 + 44 = 308
Step 8: 308 + 44 = 352
Step 9: 352 + 44 = 396
Step 10: 396 + 44 = 440
Step 11: 440 + 44 = 484
Step 12: 484 + 44 = 528
Step 13: 528 + 44 = 572
Step 14: 572 + 44 = 616
Step 15: 616 + 44 = 660

So, 44*15 = 660