OK, let's work through this together. We're starting with 730 and we're going to multiply it by 120, which means we add 730 to itself 120 times.
Step 1: 0 + 730 = 730
Step 2: 730 + 730 = 1460
Step 3: 1460 + 730 = 2190
Step 4: 2190 + 730 = 2920
Step 5: 2920 + 730 = 3650
Step 6: 3650 + 730 = 4380
Step 7: 4380 + 730 = 5110
Step 8: 5110 + 730 = 5840
Step 9: 5840 + 730 = 6570
Step 10: 6570 + 730 = 7300
Step 11: 7300 + 730 = 8030
Step 12: 8030 + 730 = 8760
Step 13: 8760 + 730 = 9490
Step 14: 9490 + 730 = 10220
Step 15: 10220 + 730 = 10950
Step 16: 10950 + 730 = 11680
Step 17: 11680 + 730 = 12410
Step 18: 12410 + 730 = 13140
Step 19: 13140 + 730 = 13870
Step 20: 13870 + 730 = 14600
Step 21: 14600 + 730 = 15330
Step 22: 15330 + 730 = 16060
Step 23: 16060 + 730 = 16790
Step 24: 16790 + 730 = 17520
Step 25: 17520 + 730 = 18250
Step 26: 18250 + 730 = 18980
Step 27: 18980 + 730 = 19710
Step 28: 19710 + 730 = 20440
Step 29: 20440 + 730 = 21170
Step 30: 21170 + 730 = 21900
Step 31: 21900 + 730 = 22630
Step 32: 22630 + 730 = 23360
Step 33: 23360 + 730 = 24090
Step 34: 24090 + 730 = 24820
Step 35: 24820 + 730 = 25550
Step 36: 25550 + 730 = 26280
Step 37: 26280 + 730 = 27010
Step 38: 27010 + 730 = 27740
Step 39: 27740 + 730 = 28470
Step 40: 28470 + 730 = 29200
Step 41: 29200 + 730 = 29930
Step 42: 29930 + 730 = 30660
Step 43: 30660 + 730 = 31390
Step 44: 31390 + 730 = 32120
Step 45: 32120 + 730 = 32850
Step 46: 32850 + 730 = 33580
Step 47: 33580 + 730 = 34310
Step 48: 34310 + 730 = 35040
Step 49: 35040 + 730 = 35770
Step 50: 35770 + 730 = 36500
Step 51: 36500 + 730 = 37230
Step 52: 37230 + 730 = 37960
Step 53: 37960 + 730 = 38690
Step 54: 38690 + 730 = 39420
Step 55: 39420 + 730 = 40150
Step 56: 40150 + 730 = 40880
Step 57: 40880 + 730 = 41610
Step 58: 41610 + 730 = 42340
Step 59: 42340 + 730 = 43070
Step 60: 43070 + 730 = 43800
Step 61: 43800 + 730 = 44530
Step 62: 44530 + 730 = 45260
Step 63: 45260 + 730 = 45990
Step 64: 45990 + 730 = 46720
Step 65: 46720 + 730 = 47450
Step 66: 47450 + 730 = 48180
Step 67: 48180 + 730 = 48910
Step 68: 48910 + 730 = 49640
Step 69: 49640 + 730 = 50370
Step 70: 50370 + 730 = 51100
Step 71: 51100 + 730 = 51830
Step 72: 51830 + 730 = 52560
Step 73: 52560 + 730 = 53290
Step 74: 53290 + 730 = 54020
Step 75: 54020 + 730 = 54750
Step 76: 54750 + 730 = 55480
Step 77: 55480 + 730 = 56210
Step 78: 56210 + 730 = 56940
Step 79: 56940 + 730 = 57670
Step 80: 57670 + 730 = 58400
Step 81: 58400 + 730 = 59130
Step 82: 59130 + 730 = 59860
Step 83: 59860 + 730 = 60590
Step 84: 60590 + 730 = 61320
Step 85: 61320 + 730 = 62050
Step 86: 62050 + 730 = 62780
Step 87: 62780 + 730 = 63510
Step 88: 63510 + 730 = 64240
Step 89: 64240 + 730 = 64970
Step 90: 64970 + 730 = 65700
Step 91: 65700 + 730 = 66430
Step 92: 66430 + 730 = 67160
Step 93: 67160 + 730 = 67890
Step 94: 67890 + 730 = 68620
Step 95: 68620 + 730 = 69350
Step 96: 69350 + 730 = 70080
Step 97: 70080 + 730 = 70810
Step 98: 70810 + 730 = 71540
Step 99: 71540 + 730 = 72270
Step 100: 72270 + 730 = 73000
Step 101: 73000 + 730 = 73730
Step 102: 73730 + 730 = 74460
Step 103: 74460 + 730 = 75190
Step 104: 75190 + 730 = 75920
Step 105: 75920 + 730 = 76650
Step 106: 76650 + 730 = 77380
Step 107: 77380 + 730 = 78110
Step 108: 78110 + 730 = 78840
Step 109: 78840 + 730 = 79570
Step 110: 79570 + 730 = 80300
Step 111: 80300 + 730 = 81030
Step 112: 81030 + 730 = 81760
Step 113: 81760 + 730 = 82490
Step 114: 82490 + 730 = 83220
Step 115: 83220 + 730 = 83950
Step 116: 83950 + 730 = 84680
Step 117: 84680 + 730 = 85410
Step 118: 85410 + 730 = 86140
Step 119: 86140 + 730 = 86870
Step 120: 86870 + 730 = 87600

So, 730*120 = 87600