Let's get this math done. We have 37 and we're going to multiply it by 15. This is the same as taking 37 and adding it to itself 15 times.
Step 1: 0 + 37 = 37
Step 2: 37 + 37 = 74
Step 3: 74 + 37 = 111
Step 4: 111 + 37 = 148
Step 5: 148 + 37 = 185
Step 6: 185 + 37 = 222
Step 7: 222 + 37 = 259
Step 8: 259 + 37 = 296
Step 9: 296 + 37 = 333
Step 10: 333 + 37 = 370
Step 11: 370 + 37 = 407
Step 12: 407 + 37 = 444
Step 13: 444 + 37 = 481
Step 14: 481 + 37 = 518
Step 15: 518 + 37 = 555

So, 37*15 = 555