OK, let's crack this. We're given 606 and our task is to multiply it by 99. Essentially, we'll be adding 606 to itself 99 times.
Step 1: 0 + 606 = 606
Step 2: 606 + 606 = 1212
Step 3: 1212 + 606 = 1818
Step 4: 1818 + 606 = 2424
Step 5: 2424 + 606 = 3030
Step 6: 3030 + 606 = 3636
Step 7: 3636 + 606 = 4242
Step 8: 4242 + 606 = 4848
Step 9: 4848 + 606 = 5454
Step 10: 5454 + 606 = 6060
Step 11: 6060 + 606 = 6666
Step 12: 6666 + 606 = 7272
Step 13: 7272 + 606 = 7878
Step 14: 7878 + 606 = 8484
Step 15: 8484 + 606 = 9090
Step 16: 9090 + 606 = 9696
Step 17: 9696 + 606 = 10302
Step 18: 10302 + 606 = 10908
Step 19: 10908 + 606 = 11514
Step 20: 11514 + 606 = 12120
Step 21: 12120 + 606 = 12726
Step 22: 12726 + 606 = 13332
Step 23: 13332 + 606 = 13938
Step 24: 13938 + 606 = 14544
Step 25: 14544 + 606 = 15150
Step 26: 15150 + 606 = 15756
Step 27: 15756 + 606 = 16362
Step 28: 16362 + 606 = 16968
Step 29: 16968 + 606 = 17574
Step 30: 17574 + 606 = 18180
Step 31: 18180 + 606 = 18786
Step 32: 18786 + 606 = 19392
Step 33: 19392 + 606 = 19998
Step 34: 19998 + 606 = 20604
Step 35: 20604 + 606 = 21210
Step 36: 21210 + 606 = 21816
Step 37: 21816 + 606 = 22422
Step 38: 22422 + 606 = 23028
Step 39: 23028 + 606 = 23634
Step 40: 23634 + 606 = 24240
Step 41: 24240 + 606 = 24846
Step 42: 24846 + 606 = 25452
Step 43: 25452 + 606 = 26058
Step 44: 26058 + 606 = 26664
Step 45: 26664 + 606 = 27270
Step 46: 27270 + 606 = 27876
Step 47: 27876 + 606 = 28482
Step 48: 28482 + 606 = 29088
Step 49: 29088 + 606 = 29694
Step 50: 29694 + 606 = 30300
Step 51: 30300 + 606 = 30906
Step 52: 30906 + 606 = 31512
Step 53: 31512 + 606 = 32118
Step 54: 32118 + 606 = 32724
Step 55: 32724 + 606 = 33330
Step 56: 33330 + 606 = 33936
Step 57: 33936 + 606 = 34542
Step 58: 34542 + 606 = 35148
Step 59: 35148 + 606 = 35754
Step 60: 35754 + 606 = 36360
Step 61: 36360 + 606 = 36966
Step 62: 36966 + 606 = 37572
Step 63: 37572 + 606 = 38178
Step 64: 38178 + 606 = 38784
Step 65: 38784 + 606 = 39390
Step 66: 39390 + 606 = 39996
Step 67: 39996 + 606 = 40602
Step 68: 40602 + 606 = 41208
Step 69: 41208 + 606 = 41814
Step 70: 41814 + 606 = 42420
Step 71: 42420 + 606 = 43026
Step 72: 43026 + 606 = 43632
Step 73: 43632 + 606 = 44238
Step 74: 44238 + 606 = 44844
Step 75: 44844 + 606 = 45450
Step 76: 45450 + 606 = 46056
Step 77: 46056 + 606 = 46662
Step 78: 46662 + 606 = 47268
Step 79: 47268 + 606 = 47874
Step 80: 47874 + 606 = 48480
Step 81: 48480 + 606 = 49086
Step 82: 49086 + 606 = 49692
Step 83: 49692 + 606 = 50298
Step 84: 50298 + 606 = 50904
Step 85: 50904 + 606 = 51510
Step 86: 51510 + 606 = 52116
Step 87: 52116 + 606 = 52722
Step 88: 52722 + 606 = 53328
Step 89: 53328 + 606 = 53934
Step 90: 53934 + 606 = 54540
Step 91: 54540 + 606 = 55146
Step 92: 55146 + 606 = 55752
Step 93: 55752 + 606 = 56358
Step 94: 56358 + 606 = 56964
Step 95: 56964 + 606 = 57570
Step 96: 57570 + 606 = 58176
Step 97: 58176 + 606 = 58782
Step 98: 58782 + 606 = 59388
Step 99: 59388 + 606 = 59994

So, 606*99 = 59994