OK, let's work through this together. We're starting with 876 and we're going to multiply it by 34, which means we add 876 to itself 34 times.
Step 1: 0 + 876 = 876
Step 2: 876 + 876 = 1752
Step 3: 1752 + 876 = 2628
Step 4: 2628 + 876 = 3504
Step 5: 3504 + 876 = 4380
Step 6: 4380 + 876 = 5256
Step 7: 5256 + 876 = 6132
Step 8: 6132 + 876 = 7008
Step 9: 7008 + 876 = 7884
Step 10: 7884 + 876 = 8760
Step 11: 8760 + 876 = 9636
Step 12: 9636 + 876 = 10512
Step 13: 10512 + 876 = 11388
Step 14: 11388 + 876 = 12264
Step 15: 12264 + 876 = 13140
Step 16: 13140 + 876 = 14016
Step 17: 14016 + 876 = 14892
Step 18: 14892 + 876 = 15768
Step 19: 15768 + 876 = 16644
Step 20: 16644 + 876 = 17520
Step 21: 17520 + 876 = 18396
Step 22: 18396 + 876 = 19272
Step 23: 19272 + 876 = 20148
Step 24: 20148 + 876 = 21024
Step 25: 21024 + 876 = 21900
Step 26: 21900 + 876 = 22776
Step 27: 22776 + 876 = 23652
Step 28: 23652 + 876 = 24528
Step 29: 24528 + 876 = 25404
Step 30: 25404 + 876 = 26280
Step 31: 26280 + 876 = 27156
Step 32: 27156 + 876 = 28032
Step 33: 28032 + 876 = 28908
Step 34: 28908 + 876 = 29784

So, 876*34 = 29784