Let's get this math done. We have 47 and we're going to multiply it by 42. This is the same as taking 47 and adding it to itself 42 times.
Step 1: 0 + 47 = 47
Step 2: 47 + 47 = 94
Step 3: 94 + 47 = 141
Step 4: 141 + 47 = 188
Step 5: 188 + 47 = 235
Step 6: 235 + 47 = 282
Step 7: 282 + 47 = 329
Step 8: 329 + 47 = 376
Step 9: 376 + 47 = 423
Step 10: 423 + 47 = 470
Step 11: 470 + 47 = 517
Step 12: 517 + 47 = 564
Step 13: 564 + 47 = 611
Step 14: 611 + 47 = 658
Step 15: 658 + 47 = 705
Step 16: 705 + 47 = 752
Step 17: 752 + 47 = 799
Step 18: 799 + 47 = 846
Step 19: 846 + 47 = 893
Step 20: 893 + 47 = 940
Step 21: 940 + 47 = 987
Step 22: 987 + 47 = 1034
Step 23: 1034 + 47 = 1081
Step 24: 1081 + 47 = 1128
Step 25: 1128 + 47 = 1175
Step 26: 1175 + 47 = 1222
Step 27: 1222 + 47 = 1269
Step 28: 1269 + 47 = 1316
Step 29: 1316 + 47 = 1363
Step 30: 1363 + 47 = 1410
Step 31: 1410 + 47 = 1457
Step 32: 1457 + 47 = 1504
Step 33: 1504 + 47 = 1551
Step 34: 1551 + 47 = 1598
Step 35: 1598 + 47 = 1645
Step 36: 1645 + 47 = 1692
Step 37: 1692 + 47 = 1739
Step 38: 1739 + 47 = 1786
Step 39: 1786 + 47 = 1833
Step 40: 1833 + 47 = 1880
Step 41: 1880 + 47 = 1927
Step 42: 1927 + 47 = 1974

So, 47*42 = 1974