Let's roll up our sleeves and solve this. We have 606 and we're going to multiply it by 51, essentially adding 606 to itself 51 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

So, 606*51 = 30906