OK, let's crack this. We're given 410 and our task is to multiply it by 42. Essentially, we'll be adding 410 to itself 42 times.
Step 1: 0 + 410 = 410
Step 2: 410 + 410 = 820
Step 3: 820 + 410 = 1230
Step 4: 1230 + 410 = 1640
Step 5: 1640 + 410 = 2050
Step 6: 2050 + 410 = 2460
Step 7: 2460 + 410 = 2870
Step 8: 2870 + 410 = 3280
Step 9: 3280 + 410 = 3690
Step 10: 3690 + 410 = 4100
Step 11: 4100 + 410 = 4510
Step 12: 4510 + 410 = 4920
Step 13: 4920 + 410 = 5330
Step 14: 5330 + 410 = 5740
Step 15: 5740 + 410 = 6150
Step 16: 6150 + 410 = 6560
Step 17: 6560 + 410 = 6970
Step 18: 6970 + 410 = 7380
Step 19: 7380 + 410 = 7790
Step 20: 7790 + 410 = 8200
Step 21: 8200 + 410 = 8610
Step 22: 8610 + 410 = 9020
Step 23: 9020 + 410 = 9430
Step 24: 9430 + 410 = 9840
Step 25: 9840 + 410 = 10250
Step 26: 10250 + 410 = 10660
Step 27: 10660 + 410 = 11070
Step 28: 11070 + 410 = 11480
Step 29: 11480 + 410 = 11890
Step 30: 11890 + 410 = 12300
Step 31: 12300 + 410 = 12710
Step 32: 12710 + 410 = 13120
Step 33: 13120 + 410 = 13530
Step 34: 13530 + 410 = 13940
Step 35: 13940 + 410 = 14350
Step 36: 14350 + 410 = 14760
Step 37: 14760 + 410 = 15170
Step 38: 15170 + 410 = 15580
Step 39: 15580 + 410 = 15990
Step 40: 15990 + 410 = 16400
Step 41: 16400 + 410 = 16810
Step 42: 16810 + 410 = 17220

So, 410*42 = 17220