OK, let's crack this. We're given 780 and our task is to multiply it by 146. Essentially, we'll be adding 780 to itself 146 times.
Step 1: 0 + 780 = 780
Step 2: 780 + 780 = 1560
Step 3: 1560 + 780 = 2340
Step 4: 2340 + 780 = 3120
Step 5: 3120 + 780 = 3900
Step 6: 3900 + 780 = 4680
Step 7: 4680 + 780 = 5460
Step 8: 5460 + 780 = 6240
Step 9: 6240 + 780 = 7020
Step 10: 7020 + 780 = 7800
Step 11: 7800 + 780 = 8580
Step 12: 8580 + 780 = 9360
Step 13: 9360 + 780 = 10140
Step 14: 10140 + 780 = 10920
Step 15: 10920 + 780 = 11700
Step 16: 11700 + 780 = 12480
Step 17: 12480 + 780 = 13260
Step 18: 13260 + 780 = 14040
Step 19: 14040 + 780 = 14820
Step 20: 14820 + 780 = 15600
Step 21: 15600 + 780 = 16380
Step 22: 16380 + 780 = 17160
Step 23: 17160 + 780 = 17940
Step 24: 17940 + 780 = 18720
Step 25: 18720 + 780 = 19500
Step 26: 19500 + 780 = 20280
Step 27: 20280 + 780 = 21060
Step 28: 21060 + 780 = 21840
Step 29: 21840 + 780 = 22620
Step 30: 22620 + 780 = 23400
Step 31: 23400 + 780 = 24180
Step 32: 24180 + 780 = 24960
Step 33: 24960 + 780 = 25740
Step 34: 25740 + 780 = 26520
Step 35: 26520 + 780 = 27300
Step 36: 27300 + 780 = 28080
Step 37: 28080 + 780 = 28860
Step 38: 28860 + 780 = 29640
Step 39: 29640 + 780 = 30420
Step 40: 30420 + 780 = 31200
Step 41: 31200 + 780 = 31980
Step 42: 31980 + 780 = 32760
Step 43: 32760 + 780 = 33540
Step 44: 33540 + 780 = 34320
Step 45: 34320 + 780 = 35100
Step 46: 35100 + 780 = 35880
Step 47: 35880 + 780 = 36660
Step 48: 36660 + 780 = 37440
Step 49: 37440 + 780 = 38220
Step 50: 38220 + 780 = 39000
Step 51: 39000 + 780 = 39780
Step 52: 39780 + 780 = 40560
Step 53: 40560 + 780 = 41340
Step 54: 41340 + 780 = 42120
Step 55: 42120 + 780 = 42900
Step 56: 42900 + 780 = 43680
Step 57: 43680 + 780 = 44460
Step 58: 44460 + 780 = 45240
Step 59: 45240 + 780 = 46020
Step 60: 46020 + 780 = 46800
Step 61: 46800 + 780 = 47580
Step 62: 47580 + 780 = 48360
Step 63: 48360 + 780 = 49140
Step 64: 49140 + 780 = 49920
Step 65: 49920 + 780 = 50700
Step 66: 50700 + 780 = 51480
Step 67: 51480 + 780 = 52260
Step 68: 52260 + 780 = 53040
Step 69: 53040 + 780 = 53820
Step 70: 53820 + 780 = 54600
Step 71: 54600 + 780 = 55380
Step 72: 55380 + 780 = 56160
Step 73: 56160 + 780 = 56940
Step 74: 56940 + 780 = 57720
Step 75: 57720 + 780 = 58500
Step 76: 58500 + 780 = 59280
Step 77: 59280 + 780 = 60060
Step 78: 60060 + 780 = 60840
Step 79: 60840 + 780 = 61620
Step 80: 61620 + 780 = 62400
Step 81: 62400 + 780 = 63180
Step 82: 63180 + 780 = 63960
Step 83: 63960 + 780 = 64740
Step 84: 64740 + 780 = 65520
Step 85: 65520 + 780 = 66300
Step 86: 66300 + 780 = 67080
Step 87: 67080 + 780 = 67860
Step 88: 67860 + 780 = 68640
Step 89: 68640 + 780 = 69420
Step 90: 69420 + 780 = 70200
Step 91: 70200 + 780 = 70980
Step 92: 70980 + 780 = 71760
Step 93: 71760 + 780 = 72540
Step 94: 72540 + 780 = 73320
Step 95: 73320 + 780 = 74100
Step 96: 74100 + 780 = 74880
Step 97: 74880 + 780 = 75660
Step 98: 75660 + 780 = 76440
Step 99: 76440 + 780 = 77220
Step 100: 77220 + 780 = 78000
Step 101: 78000 + 780 = 78780
Step 102: 78780 + 780 = 79560
Step 103: 79560 + 780 = 80340
Step 104: 80340 + 780 = 81120
Step 105: 81120 + 780 = 81900
Step 106: 81900 + 780 = 82680
Step 107: 82680 + 780 = 83460
Step 108: 83460 + 780 = 84240
Step 109: 84240 + 780 = 85020
Step 110: 85020 + 780 = 85800
Step 111: 85800 + 780 = 86580
Step 112: 86580 + 780 = 87360
Step 113: 87360 + 780 = 88140
Step 114: 88140 + 780 = 88920
Step 115: 88920 + 780 = 89700
Step 116: 89700 + 780 = 90480
Step 117: 90480 + 780 = 91260
Step 118: 91260 + 780 = 92040
Step 119: 92040 + 780 = 92820
Step 120: 92820 + 780 = 93600
Step 121: 93600 + 780 = 94380
Step 122: 94380 + 780 = 95160
Step 123: 95160 + 780 = 95940
Step 124: 95940 + 780 = 96720
Step 125: 96720 + 780 = 97500
Step 126: 97500 + 780 = 98280
Step 127: 98280 + 780 = 99060
Step 128: 99060 + 780 = 99840
Step 129: 99840 + 780 = 100620
Step 130: 100620 + 780 = 101400
Step 131: 101400 + 780 = 102180
Step 132: 102180 + 780 = 102960
Step 133: 102960 + 780 = 103740
Step 134: 103740 + 780 = 104520
Step 135: 104520 + 780 = 105300
Step 136: 105300 + 780 = 106080
Step 137: 106080 + 780 = 106860
Step 138: 106860 + 780 = 107640
Step 139: 107640 + 780 = 108420
Step 140: 108420 + 780 = 109200
Step 141: 109200 + 780 = 109980
Step 142: 109980 + 780 = 110760
Step 143: 110760 + 780 = 111540
Step 144: 111540 + 780 = 112320
Step 145: 112320 + 780 = 113100
Step 146: 113100 + 780 = 113880

So, 780*146 = 113880