OK, let's crack this. We're given 834 and our task is to multiply it by 70. Essentially, we'll be adding 834 to itself 70 times.
Step 1: 0 + 834 = 834
Step 2: 834 + 834 = 1668
Step 3: 1668 + 834 = 2502
Step 4: 2502 + 834 = 3336
Step 5: 3336 + 834 = 4170
Step 6: 4170 + 834 = 5004
Step 7: 5004 + 834 = 5838
Step 8: 5838 + 834 = 6672
Step 9: 6672 + 834 = 7506
Step 10: 7506 + 834 = 8340
Step 11: 8340 + 834 = 9174
Step 12: 9174 + 834 = 10008
Step 13: 10008 + 834 = 10842
Step 14: 10842 + 834 = 11676
Step 15: 11676 + 834 = 12510
Step 16: 12510 + 834 = 13344
Step 17: 13344 + 834 = 14178
Step 18: 14178 + 834 = 15012
Step 19: 15012 + 834 = 15846
Step 20: 15846 + 834 = 16680
Step 21: 16680 + 834 = 17514
Step 22: 17514 + 834 = 18348
Step 23: 18348 + 834 = 19182
Step 24: 19182 + 834 = 20016
Step 25: 20016 + 834 = 20850
Step 26: 20850 + 834 = 21684
Step 27: 21684 + 834 = 22518
Step 28: 22518 + 834 = 23352
Step 29: 23352 + 834 = 24186
Step 30: 24186 + 834 = 25020
Step 31: 25020 + 834 = 25854
Step 32: 25854 + 834 = 26688
Step 33: 26688 + 834 = 27522
Step 34: 27522 + 834 = 28356
Step 35: 28356 + 834 = 29190
Step 36: 29190 + 834 = 30024
Step 37: 30024 + 834 = 30858
Step 38: 30858 + 834 = 31692
Step 39: 31692 + 834 = 32526
Step 40: 32526 + 834 = 33360
Step 41: 33360 + 834 = 34194
Step 42: 34194 + 834 = 35028
Step 43: 35028 + 834 = 35862
Step 44: 35862 + 834 = 36696
Step 45: 36696 + 834 = 37530
Step 46: 37530 + 834 = 38364
Step 47: 38364 + 834 = 39198
Step 48: 39198 + 834 = 40032
Step 49: 40032 + 834 = 40866
Step 50: 40866 + 834 = 41700
Step 51: 41700 + 834 = 42534
Step 52: 42534 + 834 = 43368
Step 53: 43368 + 834 = 44202
Step 54: 44202 + 834 = 45036
Step 55: 45036 + 834 = 45870
Step 56: 45870 + 834 = 46704
Step 57: 46704 + 834 = 47538
Step 58: 47538 + 834 = 48372
Step 59: 48372 + 834 = 49206
Step 60: 49206 + 834 = 50040
Step 61: 50040 + 834 = 50874
Step 62: 50874 + 834 = 51708
Step 63: 51708 + 834 = 52542
Step 64: 52542 + 834 = 53376
Step 65: 53376 + 834 = 54210
Step 66: 54210 + 834 = 55044
Step 67: 55044 + 834 = 55878
Step 68: 55878 + 834 = 56712
Step 69: 56712 + 834 = 57546
Step 70: 57546 + 834 = 58380

So, 834*70 = 58380