OK, let's crack this. We're given 881 and our task is to multiply it by 39. Essentially, we'll be adding 881 to itself 39 times.
Step 1: 0 + 881 = 881
Step 2: 881 + 881 = 1762
Step 3: 1762 + 881 = 2643
Step 4: 2643 + 881 = 3524
Step 5: 3524 + 881 = 4405
Step 6: 4405 + 881 = 5286
Step 7: 5286 + 881 = 6167
Step 8: 6167 + 881 = 7048
Step 9: 7048 + 881 = 7929
Step 10: 7929 + 881 = 8810
Step 11: 8810 + 881 = 9691
Step 12: 9691 + 881 = 10572
Step 13: 10572 + 881 = 11453
Step 14: 11453 + 881 = 12334
Step 15: 12334 + 881 = 13215
Step 16: 13215 + 881 = 14096
Step 17: 14096 + 881 = 14977
Step 18: 14977 + 881 = 15858
Step 19: 15858 + 881 = 16739
Step 20: 16739 + 881 = 17620
Step 21: 17620 + 881 = 18501
Step 22: 18501 + 881 = 19382
Step 23: 19382 + 881 = 20263
Step 24: 20263 + 881 = 21144
Step 25: 21144 + 881 = 22025
Step 26: 22025 + 881 = 22906
Step 27: 22906 + 881 = 23787
Step 28: 23787 + 881 = 24668
Step 29: 24668 + 881 = 25549
Step 30: 25549 + 881 = 26430
Step 31: 26430 + 881 = 27311
Step 32: 27311 + 881 = 28192
Step 33: 28192 + 881 = 29073
Step 34: 29073 + 881 = 29954
Step 35: 29954 + 881 = 30835
Step 36: 30835 + 881 = 31716
Step 37: 31716 + 881 = 32597
Step 38: 32597 + 881 = 33478
Step 39: 33478 + 881 = 34359

So, 881*39 = 34359