Let's get this math done. We have 570 and we're going to multiply it by 42. This is the same as taking 570 and adding it to itself 42 times.
Step 1: 0 + 570 = 570
Step 2: 570 + 570 = 1140
Step 3: 1140 + 570 = 1710
Step 4: 1710 + 570 = 2280
Step 5: 2280 + 570 = 2850
Step 6: 2850 + 570 = 3420
Step 7: 3420 + 570 = 3990
Step 8: 3990 + 570 = 4560
Step 9: 4560 + 570 = 5130
Step 10: 5130 + 570 = 5700
Step 11: 5700 + 570 = 6270
Step 12: 6270 + 570 = 6840
Step 13: 6840 + 570 = 7410
Step 14: 7410 + 570 = 7980
Step 15: 7980 + 570 = 8550
Step 16: 8550 + 570 = 9120
Step 17: 9120 + 570 = 9690
Step 18: 9690 + 570 = 10260
Step 19: 10260 + 570 = 10830
Step 20: 10830 + 570 = 11400
Step 21: 11400 + 570 = 11970
Step 22: 11970 + 570 = 12540
Step 23: 12540 + 570 = 13110
Step 24: 13110 + 570 = 13680
Step 25: 13680 + 570 = 14250
Step 26: 14250 + 570 = 14820
Step 27: 14820 + 570 = 15390
Step 28: 15390 + 570 = 15960
Step 29: 15960 + 570 = 16530
Step 30: 16530 + 570 = 17100
Step 31: 17100 + 570 = 17670
Step 32: 17670 + 570 = 18240
Step 33: 18240 + 570 = 18810
Step 34: 18810 + 570 = 19380
Step 35: 19380 + 570 = 19950
Step 36: 19950 + 570 = 20520
Step 37: 20520 + 570 = 21090
Step 38: 21090 + 570 = 21660
Step 39: 21660 + 570 = 22230
Step 40: 22230 + 570 = 22800
Step 41: 22800 + 570 = 23370
Step 42: 23370 + 570 = 23940

So, 570*42 = 23940