Alright, let's solve this math problem step by step. First, we have the number 780. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 144. So, we're going to take the number 780 and add it to itself 144 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

So, 780*144 = 112320