Without delay, let's solve this. We've got 660 and we will be multiplying it by 261, that is, adding 660 to itself 261 times.
Step 1: 0 + 660 = 660
Step 2: 660 + 660 = 1320
Step 3: 1320 + 660 = 1980
Step 4: 1980 + 660 = 2640
Step 5: 2640 + 660 = 3300
Step 6: 3300 + 660 = 3960
Step 7: 3960 + 660 = 4620
Step 8: 4620 + 660 = 5280
Step 9: 5280 + 660 = 5940
Step 10: 5940 + 660 = 6600
Step 11: 6600 + 660 = 7260
Step 12: 7260 + 660 = 7920
Step 13: 7920 + 660 = 8580
Step 14: 8580 + 660 = 9240
Step 15: 9240 + 660 = 9900
Step 16: 9900 + 660 = 10560
Step 17: 10560 + 660 = 11220
Step 18: 11220 + 660 = 11880
Step 19: 11880 + 660 = 12540
Step 20: 12540 + 660 = 13200
Step 21: 13200 + 660 = 13860
Step 22: 13860 + 660 = 14520
Step 23: 14520 + 660 = 15180
Step 24: 15180 + 660 = 15840
Step 25: 15840 + 660 = 16500
Step 26: 16500 + 660 = 17160
Step 27: 17160 + 660 = 17820
Step 28: 17820 + 660 = 18480
Step 29: 18480 + 660 = 19140
Step 30: 19140 + 660 = 19800
Step 31: 19800 + 660 = 20460
Step 32: 20460 + 660 = 21120
Step 33: 21120 + 660 = 21780
Step 34: 21780 + 660 = 22440
Step 35: 22440 + 660 = 23100
Step 36: 23100 + 660 = 23760
Step 37: 23760 + 660 = 24420
Step 38: 24420 + 660 = 25080
Step 39: 25080 + 660 = 25740
Step 40: 25740 + 660 = 26400
Step 41: 26400 + 660 = 27060
Step 42: 27060 + 660 = 27720
Step 43: 27720 + 660 = 28380
Step 44: 28380 + 660 = 29040
Step 45: 29040 + 660 = 29700
Step 46: 29700 + 660 = 30360
Step 47: 30360 + 660 = 31020
Step 48: 31020 + 660 = 31680
Step 49: 31680 + 660 = 32340
Step 50: 32340 + 660 = 33000
Step 51: 33000 + 660 = 33660
Step 52: 33660 + 660 = 34320
Step 53: 34320 + 660 = 34980
Step 54: 34980 + 660 = 35640
Step 55: 35640 + 660 = 36300
Step 56: 36300 + 660 = 36960
Step 57: 36960 + 660 = 37620
Step 58: 37620 + 660 = 38280
Step 59: 38280 + 660 = 38940
Step 60: 38940 + 660 = 39600
Step 61: 39600 + 660 = 40260
Step 62: 40260 + 660 = 40920
Step 63: 40920 + 660 = 41580
Step 64: 41580 + 660 = 42240
Step 65: 42240 + 660 = 42900
Step 66: 42900 + 660 = 43560
Step 67: 43560 + 660 = 44220
Step 68: 44220 + 660 = 44880
Step 69: 44880 + 660 = 45540
Step 70: 45540 + 660 = 46200
Step 71: 46200 + 660 = 46860
Step 72: 46860 + 660 = 47520
Step 73: 47520 + 660 = 48180
Step 74: 48180 + 660 = 48840
Step 75: 48840 + 660 = 49500
Step 76: 49500 + 660 = 50160
Step 77: 50160 + 660 = 50820
Step 78: 50820 + 660 = 51480
Step 79: 51480 + 660 = 52140
Step 80: 52140 + 660 = 52800
Step 81: 52800 + 660 = 53460
Step 82: 53460 + 660 = 54120
Step 83: 54120 + 660 = 54780
Step 84: 54780 + 660 = 55440
Step 85: 55440 + 660 = 56100
Step 86: 56100 + 660 = 56760
Step 87: 56760 + 660 = 57420
Step 88: 57420 + 660 = 58080
Step 89: 58080 + 660 = 58740
Step 90: 58740 + 660 = 59400
Step 91: 59400 + 660 = 60060
Step 92: 60060 + 660 = 60720
Step 93: 60720 + 660 = 61380
Step 94: 61380 + 660 = 62040
Step 95: 62040 + 660 = 62700
Step 96: 62700 + 660 = 63360
Step 97: 63360 + 660 = 64020
Step 98: 64020 + 660 = 64680
Step 99: 64680 + 660 = 65340
Step 100: 65340 + 660 = 66000
Step 101: 66000 + 660 = 66660
Step 102: 66660 + 660 = 67320
Step 103: 67320 + 660 = 67980
Step 104: 67980 + 660 = 68640
Step 105: 68640 + 660 = 69300
Step 106: 69300 + 660 = 69960
Step 107: 69960 + 660 = 70620
Step 108: 70620 + 660 = 71280
Step 109: 71280 + 660 = 71940
Step 110: 71940 + 660 = 72600
Step 111: 72600 + 660 = 73260
Step 112: 73260 + 660 = 73920
Step 113: 73920 + 660 = 74580
Step 114: 74580 + 660 = 75240
Step 115: 75240 + 660 = 75900
Step 116: 75900 + 660 = 76560
Step 117: 76560 + 660 = 77220
Step 118: 77220 + 660 = 77880
Step 119: 77880 + 660 = 78540
Step 120: 78540 + 660 = 79200
Step 121: 79200 + 660 = 79860
Step 122: 79860 + 660 = 80520
Step 123: 80520 + 660 = 81180
Step 124: 81180 + 660 = 81840
Step 125: 81840 + 660 = 82500
Step 126: 82500 + 660 = 83160
Step 127: 83160 + 660 = 83820
Step 128: 83820 + 660 = 84480
Step 129: 84480 + 660 = 85140
Step 130: 85140 + 660 = 85800
Step 131: 85800 + 660 = 86460
Step 132: 86460 + 660 = 87120
Step 133: 87120 + 660 = 87780
Step 134: 87780 + 660 = 88440
Step 135: 88440 + 660 = 89100
Step 136: 89100 + 660 = 89760
Step 137: 89760 + 660 = 90420
Step 138: 90420 + 660 = 91080
Step 139: 91080 + 660 = 91740
Step 140: 91740 + 660 = 92400
Step 141: 92400 + 660 = 93060
Step 142: 93060 + 660 = 93720
Step 143: 93720 + 660 = 94380
Step 144: 94380 + 660 = 95040
Step 145: 95040 + 660 = 95700
Step 146: 95700 + 660 = 96360
Step 147: 96360 + 660 = 97020
Step 148: 97020 + 660 = 97680
Step 149: 97680 + 660 = 98340
Step 150: 98340 + 660 = 99000
Step 151: 99000 + 660 = 99660
Step 152: 99660 + 660 = 100320
Step 153: 100320 + 660 = 100980
Step 154: 100980 + 660 = 101640
Step 155: 101640 + 660 = 102300
Step 156: 102300 + 660 = 102960
Step 157: 102960 + 660 = 103620
Step 158: 103620 + 660 = 104280
Step 159: 104280 + 660 = 104940
Step 160: 104940 + 660 = 105600
Step 161: 105600 + 660 = 106260
Step 162: 106260 + 660 = 106920
Step 163: 106920 + 660 = 107580
Step 164: 107580 + 660 = 108240
Step 165: 108240 + 660 = 108900
Step 166: 108900 + 660 = 109560
Step 167: 109560 + 660 = 110220
Step 168: 110220 + 660 = 110880
Step 169: 110880 + 660 = 111540
Step 170: 111540 + 660 = 112200
Step 171: 112200 + 660 = 112860
Step 172: 112860 + 660 = 113520
Step 173: 113520 + 660 = 114180
Step 174: 114180 + 660 = 114840
Step 175: 114840 + 660 = 115500
Step 176: 115500 + 660 = 116160
Step 177: 116160 + 660 = 116820
Step 178: 116820 + 660 = 117480
Step 179: 117480 + 660 = 118140
Step 180: 118140 + 660 = 118800
Step 181: 118800 + 660 = 119460
Step 182: 119460 + 660 = 120120
Step 183: 120120 + 660 = 120780
Step 184: 120780 + 660 = 121440
Step 185: 121440 + 660 = 122100
Step 186: 122100 + 660 = 122760
Step 187: 122760 + 660 = 123420
Step 188: 123420 + 660 = 124080
Step 189: 124080 + 660 = 124740
Step 190: 124740 + 660 = 125400
Step 191: 125400 + 660 = 126060
Step 192: 126060 + 660 = 126720
Step 193: 126720 + 660 = 127380
Step 194: 127380 + 660 = 128040
Step 195: 128040 + 660 = 128700
Step 196: 128700 + 660 = 129360
Step 197: 129360 + 660 = 130020
Step 198: 130020 + 660 = 130680
Step 199: 130680 + 660 = 131340
Step 200: 131340 + 660 = 132000
Step 201: 132000 + 660 = 132660
Step 202: 132660 + 660 = 133320
Step 203: 133320 + 660 = 133980
Step 204: 133980 + 660 = 134640
Step 205: 134640 + 660 = 135300
Step 206: 135300 + 660 = 135960
Step 207: 135960 + 660 = 136620
Step 208: 136620 + 660 = 137280
Step 209: 137280 + 660 = 137940
Step 210: 137940 + 660 = 138600
Step 211: 138600 + 660 = 139260
Step 212: 139260 + 660 = 139920
Step 213: 139920 + 660 = 140580
Step 214: 140580 + 660 = 141240
Step 215: 141240 + 660 = 141900
Step 216: 141900 + 660 = 142560
Step 217: 142560 + 660 = 143220
Step 218: 143220 + 660 = 143880
Step 219: 143880 + 660 = 144540
Step 220: 144540 + 660 = 145200
Step 221: 145200 + 660 = 145860
Step 222: 145860 + 660 = 146520
Step 223: 146520 + 660 = 147180
Step 224: 147180 + 660 = 147840
Step 225: 147840 + 660 = 148500
Step 226: 148500 + 660 = 149160
Step 227: 149160 + 660 = 149820
Step 228: 149820 + 660 = 150480
Step 229: 150480 + 660 = 151140
Step 230: 151140 + 660 = 151800
Step 231: 151800 + 660 = 152460
Step 232: 152460 + 660 = 153120
Step 233: 153120 + 660 = 153780
Step 234: 153780 + 660 = 154440
Step 235: 154440 + 660 = 155100
Step 236: 155100 + 660 = 155760
Step 237: 155760 + 660 = 156420
Step 238: 156420 + 660 = 157080
Step 239: 157080 + 660 = 157740
Step 240: 157740 + 660 = 158400
Step 241: 158400 + 660 = 159060
Step 242: 159060 + 660 = 159720
Step 243: 159720 + 660 = 160380
Step 244: 160380 + 660 = 161040
Step 245: 161040 + 660 = 161700
Step 246: 161700 + 660 = 162360
Step 247: 162360 + 660 = 163020
Step 248: 163020 + 660 = 163680
Step 249: 163680 + 660 = 164340
Step 250: 164340 + 660 = 165000
Step 251: 165000 + 660 = 165660
Step 252: 165660 + 660 = 166320
Step 253: 166320 + 660 = 166980
Step 254: 166980 + 660 = 167640
Step 255: 167640 + 660 = 168300
Step 256: 168300 + 660 = 168960
Step 257: 168960 + 660 = 169620
Step 258: 169620 + 660 = 170280
Step 259: 170280 + 660 = 170940
Step 260: 170940 + 660 = 171600
Step 261: 171600 + 660 = 172260

So, 660*261 = 172260