Without delay, let's solve this. We've got 37 and we will be multiplying it by 39, that is, adding 37 to itself 39 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
Step 16: 555 + 37 = 592
Step 17: 592 + 37 = 629
Step 18: 629 + 37 = 666
Step 19: 666 + 37 = 703
Step 20: 703 + 37 = 740
Step 21: 740 + 37 = 777
Step 22: 777 + 37 = 814
Step 23: 814 + 37 = 851
Step 24: 851 + 37 = 888
Step 25: 888 + 37 = 925
Step 26: 925 + 37 = 962
Step 27: 962 + 37 = 999
Step 28: 999 + 37 = 1036
Step 29: 1036 + 37 = 1073
Step 30: 1073 + 37 = 1110
Step 31: 1110 + 37 = 1147
Step 32: 1147 + 37 = 1184
Step 33: 1184 + 37 = 1221
Step 34: 1221 + 37 = 1258
Step 35: 1258 + 37 = 1295
Step 36: 1295 + 37 = 1332
Step 37: 1332 + 37 = 1369
Step 38: 1369 + 37 = 1406
Step 39: 1406 + 37 = 1443

So, 37*39 = 1443