OK, let's work through this together. We're starting with 590 and we're going to multiply it by 42, which means we add 590 to itself 42 times.
Step 1: 0 + 590 = 590
Step 2: 590 + 590 = 1180
Step 3: 1180 + 590 = 1770
Step 4: 1770 + 590 = 2360
Step 5: 2360 + 590 = 2950
Step 6: 2950 + 590 = 3540
Step 7: 3540 + 590 = 4130
Step 8: 4130 + 590 = 4720
Step 9: 4720 + 590 = 5310
Step 10: 5310 + 590 = 5900
Step 11: 5900 + 590 = 6490
Step 12: 6490 + 590 = 7080
Step 13: 7080 + 590 = 7670
Step 14: 7670 + 590 = 8260
Step 15: 8260 + 590 = 8850
Step 16: 8850 + 590 = 9440
Step 17: 9440 + 590 = 10030
Step 18: 10030 + 590 = 10620
Step 19: 10620 + 590 = 11210
Step 20: 11210 + 590 = 11800
Step 21: 11800 + 590 = 12390
Step 22: 12390 + 590 = 12980
Step 23: 12980 + 590 = 13570
Step 24: 13570 + 590 = 14160
Step 25: 14160 + 590 = 14750
Step 26: 14750 + 590 = 15340
Step 27: 15340 + 590 = 15930
Step 28: 15930 + 590 = 16520
Step 29: 16520 + 590 = 17110
Step 30: 17110 + 590 = 17700
Step 31: 17700 + 590 = 18290
Step 32: 18290 + 590 = 18880
Step 33: 18880 + 590 = 19470
Step 34: 19470 + 590 = 20060
Step 35: 20060 + 590 = 20650
Step 36: 20650 + 590 = 21240
Step 37: 21240 + 590 = 21830
Step 38: 21830 + 590 = 22420
Step 39: 22420 + 590 = 23010
Step 40: 23010 + 590 = 23600
Step 41: 23600 + 590 = 24190
Step 42: 24190 + 590 = 24780

So, 590*42 = 24780