OK, let's work through this together. We're starting with 42 and we're going to multiply it by 56, which means we add 42 to itself 56 times.
Step 1: 0 + 42 = 42
Step 2: 42 + 42 = 84
Step 3: 84 + 42 = 126
Step 4: 126 + 42 = 168
Step 5: 168 + 42 = 210
Step 6: 210 + 42 = 252
Step 7: 252 + 42 = 294
Step 8: 294 + 42 = 336
Step 9: 336 + 42 = 378
Step 10: 378 + 42 = 420
Step 11: 420 + 42 = 462
Step 12: 462 + 42 = 504
Step 13: 504 + 42 = 546
Step 14: 546 + 42 = 588
Step 15: 588 + 42 = 630
Step 16: 630 + 42 = 672
Step 17: 672 + 42 = 714
Step 18: 714 + 42 = 756
Step 19: 756 + 42 = 798
Step 20: 798 + 42 = 840
Step 21: 840 + 42 = 882
Step 22: 882 + 42 = 924
Step 23: 924 + 42 = 966
Step 24: 966 + 42 = 1008
Step 25: 1008 + 42 = 1050
Step 26: 1050 + 42 = 1092
Step 27: 1092 + 42 = 1134
Step 28: 1134 + 42 = 1176
Step 29: 1176 + 42 = 1218
Step 30: 1218 + 42 = 1260
Step 31: 1260 + 42 = 1302
Step 32: 1302 + 42 = 1344
Step 33: 1344 + 42 = 1386
Step 34: 1386 + 42 = 1428
Step 35: 1428 + 42 = 1470
Step 36: 1470 + 42 = 1512
Step 37: 1512 + 42 = 1554
Step 38: 1554 + 42 = 1596
Step 39: 1596 + 42 = 1638
Step 40: 1638 + 42 = 1680
Step 41: 1680 + 42 = 1722
Step 42: 1722 + 42 = 1764
Step 43: 1764 + 42 = 1806
Step 44: 1806 + 42 = 1848
Step 45: 1848 + 42 = 1890
Step 46: 1890 + 42 = 1932
Step 47: 1932 + 42 = 1974
Step 48: 1974 + 42 = 2016
Step 49: 2016 + 42 = 2058
Step 50: 2058 + 42 = 2100
Step 51: 2100 + 42 = 2142
Step 52: 2142 + 42 = 2184
Step 53: 2184 + 42 = 2226
Step 54: 2226 + 42 = 2268
Step 55: 2268 + 42 = 2310
Step 56: 2310 + 42 = 2352

So, 42*56 = 2352