OK, let's work through this together. We're starting with 227 and we're going to multiply it by 15, which means we add 227 to itself 15 times.
Step 1: 0 + 227 = 227
Step 2: 227 + 227 = 454
Step 3: 454 + 227 = 681
Step 4: 681 + 227 = 908
Step 5: 908 + 227 = 1135
Step 6: 1135 + 227 = 1362
Step 7: 1362 + 227 = 1589
Step 8: 1589 + 227 = 1816
Step 9: 1816 + 227 = 2043
Step 10: 2043 + 227 = 2270
Step 11: 2270 + 227 = 2497
Step 12: 2497 + 227 = 2724
Step 13: 2724 + 227 = 2951
Step 14: 2951 + 227 = 3178
Step 15: 3178 + 227 = 3405

So, 227*15 = 3405