Let's roll up our sleeves and solve this. We have 914 and we're going to multiply it by 31, essentially adding 914 to itself 31 times.
Step 1: 0 + 914 = 914
Step 2: 914 + 914 = 1828
Step 3: 1828 + 914 = 2742
Step 4: 2742 + 914 = 3656
Step 5: 3656 + 914 = 4570
Step 6: 4570 + 914 = 5484
Step 7: 5484 + 914 = 6398
Step 8: 6398 + 914 = 7312
Step 9: 7312 + 914 = 8226
Step 10: 8226 + 914 = 9140
Step 11: 9140 + 914 = 10054
Step 12: 10054 + 914 = 10968
Step 13: 10968 + 914 = 11882
Step 14: 11882 + 914 = 12796
Step 15: 12796 + 914 = 13710
Step 16: 13710 + 914 = 14624
Step 17: 14624 + 914 = 15538
Step 18: 15538 + 914 = 16452
Step 19: 16452 + 914 = 17366
Step 20: 17366 + 914 = 18280
Step 21: 18280 + 914 = 19194
Step 22: 19194 + 914 = 20108
Step 23: 20108 + 914 = 21022
Step 24: 21022 + 914 = 21936
Step 25: 21936 + 914 = 22850
Step 26: 22850 + 914 = 23764
Step 27: 23764 + 914 = 24678
Step 28: 24678 + 914 = 25592
Step 29: 25592 + 914 = 26506
Step 30: 26506 + 914 = 27420
Step 31: 27420 + 914 = 28334

So, 914*31 = 28334