OK, let's work through this together. We're starting with 978 and we're going to multiply it by 142, which means we add 978 to itself 142 times.
Step 1: 0 + 978 = 978
Step 2: 978 + 978 = 1956
Step 3: 1956 + 978 = 2934
Step 4: 2934 + 978 = 3912
Step 5: 3912 + 978 = 4890
Step 6: 4890 + 978 = 5868
Step 7: 5868 + 978 = 6846
Step 8: 6846 + 978 = 7824
Step 9: 7824 + 978 = 8802
Step 10: 8802 + 978 = 9780
Step 11: 9780 + 978 = 10758
Step 12: 10758 + 978 = 11736
Step 13: 11736 + 978 = 12714
Step 14: 12714 + 978 = 13692
Step 15: 13692 + 978 = 14670
Step 16: 14670 + 978 = 15648
Step 17: 15648 + 978 = 16626
Step 18: 16626 + 978 = 17604
Step 19: 17604 + 978 = 18582
Step 20: 18582 + 978 = 19560
Step 21: 19560 + 978 = 20538
Step 22: 20538 + 978 = 21516
Step 23: 21516 + 978 = 22494
Step 24: 22494 + 978 = 23472
Step 25: 23472 + 978 = 24450
Step 26: 24450 + 978 = 25428
Step 27: 25428 + 978 = 26406
Step 28: 26406 + 978 = 27384
Step 29: 27384 + 978 = 28362
Step 30: 28362 + 978 = 29340
Step 31: 29340 + 978 = 30318
Step 32: 30318 + 978 = 31296
Step 33: 31296 + 978 = 32274
Step 34: 32274 + 978 = 33252
Step 35: 33252 + 978 = 34230
Step 36: 34230 + 978 = 35208
Step 37: 35208 + 978 = 36186
Step 38: 36186 + 978 = 37164
Step 39: 37164 + 978 = 38142
Step 40: 38142 + 978 = 39120
Step 41: 39120 + 978 = 40098
Step 42: 40098 + 978 = 41076
Step 43: 41076 + 978 = 42054
Step 44: 42054 + 978 = 43032
Step 45: 43032 + 978 = 44010
Step 46: 44010 + 978 = 44988
Step 47: 44988 + 978 = 45966
Step 48: 45966 + 978 = 46944
Step 49: 46944 + 978 = 47922
Step 50: 47922 + 978 = 48900
Step 51: 48900 + 978 = 49878
Step 52: 49878 + 978 = 50856
Step 53: 50856 + 978 = 51834
Step 54: 51834 + 978 = 52812
Step 55: 52812 + 978 = 53790
Step 56: 53790 + 978 = 54768
Step 57: 54768 + 978 = 55746
Step 58: 55746 + 978 = 56724
Step 59: 56724 + 978 = 57702
Step 60: 57702 + 978 = 58680
Step 61: 58680 + 978 = 59658
Step 62: 59658 + 978 = 60636
Step 63: 60636 + 978 = 61614
Step 64: 61614 + 978 = 62592
Step 65: 62592 + 978 = 63570
Step 66: 63570 + 978 = 64548
Step 67: 64548 + 978 = 65526
Step 68: 65526 + 978 = 66504
Step 69: 66504 + 978 = 67482
Step 70: 67482 + 978 = 68460
Step 71: 68460 + 978 = 69438
Step 72: 69438 + 978 = 70416
Step 73: 70416 + 978 = 71394
Step 74: 71394 + 978 = 72372
Step 75: 72372 + 978 = 73350
Step 76: 73350 + 978 = 74328
Step 77: 74328 + 978 = 75306
Step 78: 75306 + 978 = 76284
Step 79: 76284 + 978 = 77262
Step 80: 77262 + 978 = 78240
Step 81: 78240 + 978 = 79218
Step 82: 79218 + 978 = 80196
Step 83: 80196 + 978 = 81174
Step 84: 81174 + 978 = 82152
Step 85: 82152 + 978 = 83130
Step 86: 83130 + 978 = 84108
Step 87: 84108 + 978 = 85086
Step 88: 85086 + 978 = 86064
Step 89: 86064 + 978 = 87042
Step 90: 87042 + 978 = 88020
Step 91: 88020 + 978 = 88998
Step 92: 88998 + 978 = 89976
Step 93: 89976 + 978 = 90954
Step 94: 90954 + 978 = 91932
Step 95: 91932 + 978 = 92910
Step 96: 92910 + 978 = 93888
Step 97: 93888 + 978 = 94866
Step 98: 94866 + 978 = 95844
Step 99: 95844 + 978 = 96822
Step 100: 96822 + 978 = 97800
Step 101: 97800 + 978 = 98778
Step 102: 98778 + 978 = 99756
Step 103: 99756 + 978 = 100734
Step 104: 100734 + 978 = 101712
Step 105: 101712 + 978 = 102690
Step 106: 102690 + 978 = 103668
Step 107: 103668 + 978 = 104646
Step 108: 104646 + 978 = 105624
Step 109: 105624 + 978 = 106602
Step 110: 106602 + 978 = 107580
Step 111: 107580 + 978 = 108558
Step 112: 108558 + 978 = 109536
Step 113: 109536 + 978 = 110514
Step 114: 110514 + 978 = 111492
Step 115: 111492 + 978 = 112470
Step 116: 112470 + 978 = 113448
Step 117: 113448 + 978 = 114426
Step 118: 114426 + 978 = 115404
Step 119: 115404 + 978 = 116382
Step 120: 116382 + 978 = 117360
Step 121: 117360 + 978 = 118338
Step 122: 118338 + 978 = 119316
Step 123: 119316 + 978 = 120294
Step 124: 120294 + 978 = 121272
Step 125: 121272 + 978 = 122250
Step 126: 122250 + 978 = 123228
Step 127: 123228 + 978 = 124206
Step 128: 124206 + 978 = 125184
Step 129: 125184 + 978 = 126162
Step 130: 126162 + 978 = 127140
Step 131: 127140 + 978 = 128118
Step 132: 128118 + 978 = 129096
Step 133: 129096 + 978 = 130074
Step 134: 130074 + 978 = 131052
Step 135: 131052 + 978 = 132030
Step 136: 132030 + 978 = 133008
Step 137: 133008 + 978 = 133986
Step 138: 133986 + 978 = 134964
Step 139: 134964 + 978 = 135942
Step 140: 135942 + 978 = 136920
Step 141: 136920 + 978 = 137898
Step 142: 137898 + 978 = 138876

So, 978*142 = 138876