Without delay, let's solve this. We've got 631 and we will be multiplying it by 51, that is, adding 631 to itself 51 times.
Step 1: 0 + 631 = 631
Step 2: 631 + 631 = 1262
Step 3: 1262 + 631 = 1893
Step 4: 1893 + 631 = 2524
Step 5: 2524 + 631 = 3155
Step 6: 3155 + 631 = 3786
Step 7: 3786 + 631 = 4417
Step 8: 4417 + 631 = 5048
Step 9: 5048 + 631 = 5679
Step 10: 5679 + 631 = 6310
Step 11: 6310 + 631 = 6941
Step 12: 6941 + 631 = 7572
Step 13: 7572 + 631 = 8203
Step 14: 8203 + 631 = 8834
Step 15: 8834 + 631 = 9465
Step 16: 9465 + 631 = 10096
Step 17: 10096 + 631 = 10727
Step 18: 10727 + 631 = 11358
Step 19: 11358 + 631 = 11989
Step 20: 11989 + 631 = 12620
Step 21: 12620 + 631 = 13251
Step 22: 13251 + 631 = 13882
Step 23: 13882 + 631 = 14513
Step 24: 14513 + 631 = 15144
Step 25: 15144 + 631 = 15775
Step 26: 15775 + 631 = 16406
Step 27: 16406 + 631 = 17037
Step 28: 17037 + 631 = 17668
Step 29: 17668 + 631 = 18299
Step 30: 18299 + 631 = 18930
Step 31: 18930 + 631 = 19561
Step 32: 19561 + 631 = 20192
Step 33: 20192 + 631 = 20823
Step 34: 20823 + 631 = 21454
Step 35: 21454 + 631 = 22085
Step 36: 22085 + 631 = 22716
Step 37: 22716 + 631 = 23347
Step 38: 23347 + 631 = 23978
Step 39: 23978 + 631 = 24609
Step 40: 24609 + 631 = 25240
Step 41: 25240 + 631 = 25871
Step 42: 25871 + 631 = 26502
Step 43: 26502 + 631 = 27133
Step 44: 27133 + 631 = 27764
Step 45: 27764 + 631 = 28395
Step 46: 28395 + 631 = 29026
Step 47: 29026 + 631 = 29657
Step 48: 29657 + 631 = 30288
Step 49: 30288 + 631 = 30919
Step 50: 30919 + 631 = 31550
Step 51: 31550 + 631 = 32181

So, 631*51 = 32181