Without delay, let's solve this. We've got 801 and we will be multiplying it by 51, that is, adding 801 to itself 51 times.
Step 1: 0 + 801 = 801
Step 2: 801 + 801 = 1602
Step 3: 1602 + 801 = 2403
Step 4: 2403 + 801 = 3204
Step 5: 3204 + 801 = 4005
Step 6: 4005 + 801 = 4806
Step 7: 4806 + 801 = 5607
Step 8: 5607 + 801 = 6408
Step 9: 6408 + 801 = 7209
Step 10: 7209 + 801 = 8010
Step 11: 8010 + 801 = 8811
Step 12: 8811 + 801 = 9612
Step 13: 9612 + 801 = 10413
Step 14: 10413 + 801 = 11214
Step 15: 11214 + 801 = 12015
Step 16: 12015 + 801 = 12816
Step 17: 12816 + 801 = 13617
Step 18: 13617 + 801 = 14418
Step 19: 14418 + 801 = 15219
Step 20: 15219 + 801 = 16020
Step 21: 16020 + 801 = 16821
Step 22: 16821 + 801 = 17622
Step 23: 17622 + 801 = 18423
Step 24: 18423 + 801 = 19224
Step 25: 19224 + 801 = 20025
Step 26: 20025 + 801 = 20826
Step 27: 20826 + 801 = 21627
Step 28: 21627 + 801 = 22428
Step 29: 22428 + 801 = 23229
Step 30: 23229 + 801 = 24030
Step 31: 24030 + 801 = 24831
Step 32: 24831 + 801 = 25632
Step 33: 25632 + 801 = 26433
Step 34: 26433 + 801 = 27234
Step 35: 27234 + 801 = 28035
Step 36: 28035 + 801 = 28836
Step 37: 28836 + 801 = 29637
Step 38: 29637 + 801 = 30438
Step 39: 30438 + 801 = 31239
Step 40: 31239 + 801 = 32040
Step 41: 32040 + 801 = 32841
Step 42: 32841 + 801 = 33642
Step 43: 33642 + 801 = 34443
Step 44: 34443 + 801 = 35244
Step 45: 35244 + 801 = 36045
Step 46: 36045 + 801 = 36846
Step 47: 36846 + 801 = 37647
Step 48: 37647 + 801 = 38448
Step 49: 38448 + 801 = 39249
Step 50: 39249 + 801 = 40050
Step 51: 40050 + 801 = 40851

So, 801*51 = 40851