OK, let's work through this together. We're starting with 170 and we're going to multiply it by 220, which means we add 170 to itself 220 times.
Step 1: 0 + 170 = 170
Step 2: 170 + 170 = 340
Step 3: 340 + 170 = 510
Step 4: 510 + 170 = 680
Step 5: 680 + 170 = 850
Step 6: 850 + 170 = 1020
Step 7: 1020 + 170 = 1190
Step 8: 1190 + 170 = 1360
Step 9: 1360 + 170 = 1530
Step 10: 1530 + 170 = 1700
Step 11: 1700 + 170 = 1870
Step 12: 1870 + 170 = 2040
Step 13: 2040 + 170 = 2210
Step 14: 2210 + 170 = 2380
Step 15: 2380 + 170 = 2550
Step 16: 2550 + 170 = 2720
Step 17: 2720 + 170 = 2890
Step 18: 2890 + 170 = 3060
Step 19: 3060 + 170 = 3230
Step 20: 3230 + 170 = 3400
Step 21: 3400 + 170 = 3570
Step 22: 3570 + 170 = 3740
Step 23: 3740 + 170 = 3910
Step 24: 3910 + 170 = 4080
Step 25: 4080 + 170 = 4250
Step 26: 4250 + 170 = 4420
Step 27: 4420 + 170 = 4590
Step 28: 4590 + 170 = 4760
Step 29: 4760 + 170 = 4930
Step 30: 4930 + 170 = 5100
Step 31: 5100 + 170 = 5270
Step 32: 5270 + 170 = 5440
Step 33: 5440 + 170 = 5610
Step 34: 5610 + 170 = 5780
Step 35: 5780 + 170 = 5950
Step 36: 5950 + 170 = 6120
Step 37: 6120 + 170 = 6290
Step 38: 6290 + 170 = 6460
Step 39: 6460 + 170 = 6630
Step 40: 6630 + 170 = 6800
Step 41: 6800 + 170 = 6970
Step 42: 6970 + 170 = 7140
Step 43: 7140 + 170 = 7310
Step 44: 7310 + 170 = 7480
Step 45: 7480 + 170 = 7650
Step 46: 7650 + 170 = 7820
Step 47: 7820 + 170 = 7990
Step 48: 7990 + 170 = 8160
Step 49: 8160 + 170 = 8330
Step 50: 8330 + 170 = 8500
Step 51: 8500 + 170 = 8670
Step 52: 8670 + 170 = 8840
Step 53: 8840 + 170 = 9010
Step 54: 9010 + 170 = 9180
Step 55: 9180 + 170 = 9350
Step 56: 9350 + 170 = 9520
Step 57: 9520 + 170 = 9690
Step 58: 9690 + 170 = 9860
Step 59: 9860 + 170 = 10030
Step 60: 10030 + 170 = 10200
Step 61: 10200 + 170 = 10370
Step 62: 10370 + 170 = 10540
Step 63: 10540 + 170 = 10710
Step 64: 10710 + 170 = 10880
Step 65: 10880 + 170 = 11050
Step 66: 11050 + 170 = 11220
Step 67: 11220 + 170 = 11390
Step 68: 11390 + 170 = 11560
Step 69: 11560 + 170 = 11730
Step 70: 11730 + 170 = 11900
Step 71: 11900 + 170 = 12070
Step 72: 12070 + 170 = 12240
Step 73: 12240 + 170 = 12410
Step 74: 12410 + 170 = 12580
Step 75: 12580 + 170 = 12750
Step 76: 12750 + 170 = 12920
Step 77: 12920 + 170 = 13090
Step 78: 13090 + 170 = 13260
Step 79: 13260 + 170 = 13430
Step 80: 13430 + 170 = 13600
Step 81: 13600 + 170 = 13770
Step 82: 13770 + 170 = 13940
Step 83: 13940 + 170 = 14110
Step 84: 14110 + 170 = 14280
Step 85: 14280 + 170 = 14450
Step 86: 14450 + 170 = 14620
Step 87: 14620 + 170 = 14790
Step 88: 14790 + 170 = 14960
Step 89: 14960 + 170 = 15130
Step 90: 15130 + 170 = 15300
Step 91: 15300 + 170 = 15470
Step 92: 15470 + 170 = 15640
Step 93: 15640 + 170 = 15810
Step 94: 15810 + 170 = 15980
Step 95: 15980 + 170 = 16150
Step 96: 16150 + 170 = 16320
Step 97: 16320 + 170 = 16490
Step 98: 16490 + 170 = 16660
Step 99: 16660 + 170 = 16830
Step 100: 16830 + 170 = 17000
Step 101: 17000 + 170 = 17170
Step 102: 17170 + 170 = 17340
Step 103: 17340 + 170 = 17510
Step 104: 17510 + 170 = 17680
Step 105: 17680 + 170 = 17850
Step 106: 17850 + 170 = 18020
Step 107: 18020 + 170 = 18190
Step 108: 18190 + 170 = 18360
Step 109: 18360 + 170 = 18530
Step 110: 18530 + 170 = 18700
Step 111: 18700 + 170 = 18870
Step 112: 18870 + 170 = 19040
Step 113: 19040 + 170 = 19210
Step 114: 19210 + 170 = 19380
Step 115: 19380 + 170 = 19550
Step 116: 19550 + 170 = 19720
Step 117: 19720 + 170 = 19890
Step 118: 19890 + 170 = 20060
Step 119: 20060 + 170 = 20230
Step 120: 20230 + 170 = 20400
Step 121: 20400 + 170 = 20570
Step 122: 20570 + 170 = 20740
Step 123: 20740 + 170 = 20910
Step 124: 20910 + 170 = 21080
Step 125: 21080 + 170 = 21250
Step 126: 21250 + 170 = 21420
Step 127: 21420 + 170 = 21590
Step 128: 21590 + 170 = 21760
Step 129: 21760 + 170 = 21930
Step 130: 21930 + 170 = 22100
Step 131: 22100 + 170 = 22270
Step 132: 22270 + 170 = 22440
Step 133: 22440 + 170 = 22610
Step 134: 22610 + 170 = 22780
Step 135: 22780 + 170 = 22950
Step 136: 22950 + 170 = 23120
Step 137: 23120 + 170 = 23290
Step 138: 23290 + 170 = 23460
Step 139: 23460 + 170 = 23630
Step 140: 23630 + 170 = 23800
Step 141: 23800 + 170 = 23970
Step 142: 23970 + 170 = 24140
Step 143: 24140 + 170 = 24310
Step 144: 24310 + 170 = 24480
Step 145: 24480 + 170 = 24650
Step 146: 24650 + 170 = 24820
Step 147: 24820 + 170 = 24990
Step 148: 24990 + 170 = 25160
Step 149: 25160 + 170 = 25330
Step 150: 25330 + 170 = 25500
Step 151: 25500 + 170 = 25670
Step 152: 25670 + 170 = 25840
Step 153: 25840 + 170 = 26010
Step 154: 26010 + 170 = 26180
Step 155: 26180 + 170 = 26350
Step 156: 26350 + 170 = 26520
Step 157: 26520 + 170 = 26690
Step 158: 26690 + 170 = 26860
Step 159: 26860 + 170 = 27030
Step 160: 27030 + 170 = 27200
Step 161: 27200 + 170 = 27370
Step 162: 27370 + 170 = 27540
Step 163: 27540 + 170 = 27710
Step 164: 27710 + 170 = 27880
Step 165: 27880 + 170 = 28050
Step 166: 28050 + 170 = 28220
Step 167: 28220 + 170 = 28390
Step 168: 28390 + 170 = 28560
Step 169: 28560 + 170 = 28730
Step 170: 28730 + 170 = 28900
Step 171: 28900 + 170 = 29070
Step 172: 29070 + 170 = 29240
Step 173: 29240 + 170 = 29410
Step 174: 29410 + 170 = 29580
Step 175: 29580 + 170 = 29750
Step 176: 29750 + 170 = 29920
Step 177: 29920 + 170 = 30090
Step 178: 30090 + 170 = 30260
Step 179: 30260 + 170 = 30430
Step 180: 30430 + 170 = 30600
Step 181: 30600 + 170 = 30770
Step 182: 30770 + 170 = 30940
Step 183: 30940 + 170 = 31110
Step 184: 31110 + 170 = 31280
Step 185: 31280 + 170 = 31450
Step 186: 31450 + 170 = 31620
Step 187: 31620 + 170 = 31790
Step 188: 31790 + 170 = 31960
Step 189: 31960 + 170 = 32130
Step 190: 32130 + 170 = 32300
Step 191: 32300 + 170 = 32470
Step 192: 32470 + 170 = 32640
Step 193: 32640 + 170 = 32810
Step 194: 32810 + 170 = 32980
Step 195: 32980 + 170 = 33150
Step 196: 33150 + 170 = 33320
Step 197: 33320 + 170 = 33490
Step 198: 33490 + 170 = 33660
Step 199: 33660 + 170 = 33830
Step 200: 33830 + 170 = 34000
Step 201: 34000 + 170 = 34170
Step 202: 34170 + 170 = 34340
Step 203: 34340 + 170 = 34510
Step 204: 34510 + 170 = 34680
Step 205: 34680 + 170 = 34850
Step 206: 34850 + 170 = 35020
Step 207: 35020 + 170 = 35190
Step 208: 35190 + 170 = 35360
Step 209: 35360 + 170 = 35530
Step 210: 35530 + 170 = 35700
Step 211: 35700 + 170 = 35870
Step 212: 35870 + 170 = 36040
Step 213: 36040 + 170 = 36210
Step 214: 36210 + 170 = 36380
Step 215: 36380 + 170 = 36550
Step 216: 36550 + 170 = 36720
Step 217: 36720 + 170 = 36890
Step 218: 36890 + 170 = 37060
Step 219: 37060 + 170 = 37230
Step 220: 37230 + 170 = 37400

So, 170*220 = 37400