Let's roll up our sleeves and solve this. We have 847 and we're going to multiply it by 24, essentially adding 847 to itself 24 times.
Step 1: 0 + 847 = 847
Step 2: 847 + 847 = 1694
Step 3: 1694 + 847 = 2541
Step 4: 2541 + 847 = 3388
Step 5: 3388 + 847 = 4235
Step 6: 4235 + 847 = 5082
Step 7: 5082 + 847 = 5929
Step 8: 5929 + 847 = 6776
Step 9: 6776 + 847 = 7623
Step 10: 7623 + 847 = 8470
Step 11: 8470 + 847 = 9317
Step 12: 9317 + 847 = 10164
Step 13: 10164 + 847 = 11011
Step 14: 11011 + 847 = 11858
Step 15: 11858 + 847 = 12705
Step 16: 12705 + 847 = 13552
Step 17: 13552 + 847 = 14399
Step 18: 14399 + 847 = 15246
Step 19: 15246 + 847 = 16093
Step 20: 16093 + 847 = 16940
Step 21: 16940 + 847 = 17787
Step 22: 17787 + 847 = 18634
Step 23: 18634 + 847 = 19481
Step 24: 19481 + 847 = 20328

So, 847*24 = 20328