OK, let's crack this. We're given 910 and our task is to multiply it by 109. Essentially, we'll be adding 910 to itself 109 times.
Step 1: 0 + 910 = 910
Step 2: 910 + 910 = 1820
Step 3: 1820 + 910 = 2730
Step 4: 2730 + 910 = 3640
Step 5: 3640 + 910 = 4550
Step 6: 4550 + 910 = 5460
Step 7: 5460 + 910 = 6370
Step 8: 6370 + 910 = 7280
Step 9: 7280 + 910 = 8190
Step 10: 8190 + 910 = 9100
Step 11: 9100 + 910 = 10010
Step 12: 10010 + 910 = 10920
Step 13: 10920 + 910 = 11830
Step 14: 11830 + 910 = 12740
Step 15: 12740 + 910 = 13650
Step 16: 13650 + 910 = 14560
Step 17: 14560 + 910 = 15470
Step 18: 15470 + 910 = 16380
Step 19: 16380 + 910 = 17290
Step 20: 17290 + 910 = 18200
Step 21: 18200 + 910 = 19110
Step 22: 19110 + 910 = 20020
Step 23: 20020 + 910 = 20930
Step 24: 20930 + 910 = 21840
Step 25: 21840 + 910 = 22750
Step 26: 22750 + 910 = 23660
Step 27: 23660 + 910 = 24570
Step 28: 24570 + 910 = 25480
Step 29: 25480 + 910 = 26390
Step 30: 26390 + 910 = 27300
Step 31: 27300 + 910 = 28210
Step 32: 28210 + 910 = 29120
Step 33: 29120 + 910 = 30030
Step 34: 30030 + 910 = 30940
Step 35: 30940 + 910 = 31850
Step 36: 31850 + 910 = 32760
Step 37: 32760 + 910 = 33670
Step 38: 33670 + 910 = 34580
Step 39: 34580 + 910 = 35490
Step 40: 35490 + 910 = 36400
Step 41: 36400 + 910 = 37310
Step 42: 37310 + 910 = 38220
Step 43: 38220 + 910 = 39130
Step 44: 39130 + 910 = 40040
Step 45: 40040 + 910 = 40950
Step 46: 40950 + 910 = 41860
Step 47: 41860 + 910 = 42770
Step 48: 42770 + 910 = 43680
Step 49: 43680 + 910 = 44590
Step 50: 44590 + 910 = 45500
Step 51: 45500 + 910 = 46410
Step 52: 46410 + 910 = 47320
Step 53: 47320 + 910 = 48230
Step 54: 48230 + 910 = 49140
Step 55: 49140 + 910 = 50050
Step 56: 50050 + 910 = 50960
Step 57: 50960 + 910 = 51870
Step 58: 51870 + 910 = 52780
Step 59: 52780 + 910 = 53690
Step 60: 53690 + 910 = 54600
Step 61: 54600 + 910 = 55510
Step 62: 55510 + 910 = 56420
Step 63: 56420 + 910 = 57330
Step 64: 57330 + 910 = 58240
Step 65: 58240 + 910 = 59150
Step 66: 59150 + 910 = 60060
Step 67: 60060 + 910 = 60970
Step 68: 60970 + 910 = 61880
Step 69: 61880 + 910 = 62790
Step 70: 62790 + 910 = 63700
Step 71: 63700 + 910 = 64610
Step 72: 64610 + 910 = 65520
Step 73: 65520 + 910 = 66430
Step 74: 66430 + 910 = 67340
Step 75: 67340 + 910 = 68250
Step 76: 68250 + 910 = 69160
Step 77: 69160 + 910 = 70070
Step 78: 70070 + 910 = 70980
Step 79: 70980 + 910 = 71890
Step 80: 71890 + 910 = 72800
Step 81: 72800 + 910 = 73710
Step 82: 73710 + 910 = 74620
Step 83: 74620 + 910 = 75530
Step 84: 75530 + 910 = 76440
Step 85: 76440 + 910 = 77350
Step 86: 77350 + 910 = 78260
Step 87: 78260 + 910 = 79170
Step 88: 79170 + 910 = 80080
Step 89: 80080 + 910 = 80990
Step 90: 80990 + 910 = 81900
Step 91: 81900 + 910 = 82810
Step 92: 82810 + 910 = 83720
Step 93: 83720 + 910 = 84630
Step 94: 84630 + 910 = 85540
Step 95: 85540 + 910 = 86450
Step 96: 86450 + 910 = 87360
Step 97: 87360 + 910 = 88270
Step 98: 88270 + 910 = 89180
Step 99: 89180 + 910 = 90090
Step 100: 90090 + 910 = 91000
Step 101: 91000 + 910 = 91910
Step 102: 91910 + 910 = 92820
Step 103: 92820 + 910 = 93730
Step 104: 93730 + 910 = 94640
Step 105: 94640 + 910 = 95550
Step 106: 95550 + 910 = 96460
Step 107: 96460 + 910 = 97370
Step 108: 97370 + 910 = 98280
Step 109: 98280 + 910 = 99190

So, 910*109 = 99190