Let's roll up our sleeves and solve this. We have 867 and we're going to multiply it by 28, essentially adding 867 to itself 28 times.
Step 1: 0 + 867 = 867
Step 2: 867 + 867 = 1734
Step 3: 1734 + 867 = 2601
Step 4: 2601 + 867 = 3468
Step 5: 3468 + 867 = 4335
Step 6: 4335 + 867 = 5202
Step 7: 5202 + 867 = 6069
Step 8: 6069 + 867 = 6936
Step 9: 6936 + 867 = 7803
Step 10: 7803 + 867 = 8670
Step 11: 8670 + 867 = 9537
Step 12: 9537 + 867 = 10404
Step 13: 10404 + 867 = 11271
Step 14: 11271 + 867 = 12138
Step 15: 12138 + 867 = 13005
Step 16: 13005 + 867 = 13872
Step 17: 13872 + 867 = 14739
Step 18: 14739 + 867 = 15606
Step 19: 15606 + 867 = 16473
Step 20: 16473 + 867 = 17340
Step 21: 17340 + 867 = 18207
Step 22: 18207 + 867 = 19074
Step 23: 19074 + 867 = 19941
Step 24: 19941 + 867 = 20808
Step 25: 20808 + 867 = 21675
Step 26: 21675 + 867 = 22542
Step 27: 22542 + 867 = 23409
Step 28: 23409 + 867 = 24276

So, 867*28 = 24276