Sure thing! We've got 631 and we're gonna multiply it by 28. That's the same as adding 631 to itself 28 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

So, 631*28 = 17668