OK, let's work through this together. We're starting with 310 and we're going to multiply it by 320, which means we add 310 to itself 320 times.
Step 1: 0 + 310 = 310
Step 2: 310 + 310 = 620
Step 3: 620 + 310 = 930
Step 4: 930 + 310 = 1240
Step 5: 1240 + 310 = 1550
Step 6: 1550 + 310 = 1860
Step 7: 1860 + 310 = 2170
Step 8: 2170 + 310 = 2480
Step 9: 2480 + 310 = 2790
Step 10: 2790 + 310 = 3100
Step 11: 3100 + 310 = 3410
Step 12: 3410 + 310 = 3720
Step 13: 3720 + 310 = 4030
Step 14: 4030 + 310 = 4340
Step 15: 4340 + 310 = 4650
Step 16: 4650 + 310 = 4960
Step 17: 4960 + 310 = 5270
Step 18: 5270 + 310 = 5580
Step 19: 5580 + 310 = 5890
Step 20: 5890 + 310 = 6200
Step 21: 6200 + 310 = 6510
Step 22: 6510 + 310 = 6820
Step 23: 6820 + 310 = 7130
Step 24: 7130 + 310 = 7440
Step 25: 7440 + 310 = 7750
Step 26: 7750 + 310 = 8060
Step 27: 8060 + 310 = 8370
Step 28: 8370 + 310 = 8680
Step 29: 8680 + 310 = 8990
Step 30: 8990 + 310 = 9300
Step 31: 9300 + 310 = 9610
Step 32: 9610 + 310 = 9920
Step 33: 9920 + 310 = 10230
Step 34: 10230 + 310 = 10540
Step 35: 10540 + 310 = 10850
Step 36: 10850 + 310 = 11160
Step 37: 11160 + 310 = 11470
Step 38: 11470 + 310 = 11780
Step 39: 11780 + 310 = 12090
Step 40: 12090 + 310 = 12400
Step 41: 12400 + 310 = 12710
Step 42: 12710 + 310 = 13020
Step 43: 13020 + 310 = 13330
Step 44: 13330 + 310 = 13640
Step 45: 13640 + 310 = 13950
Step 46: 13950 + 310 = 14260
Step 47: 14260 + 310 = 14570
Step 48: 14570 + 310 = 14880
Step 49: 14880 + 310 = 15190
Step 50: 15190 + 310 = 15500
Step 51: 15500 + 310 = 15810
Step 52: 15810 + 310 = 16120
Step 53: 16120 + 310 = 16430
Step 54: 16430 + 310 = 16740
Step 55: 16740 + 310 = 17050
Step 56: 17050 + 310 = 17360
Step 57: 17360 + 310 = 17670
Step 58: 17670 + 310 = 17980
Step 59: 17980 + 310 = 18290
Step 60: 18290 + 310 = 18600
Step 61: 18600 + 310 = 18910
Step 62: 18910 + 310 = 19220
Step 63: 19220 + 310 = 19530
Step 64: 19530 + 310 = 19840
Step 65: 19840 + 310 = 20150
Step 66: 20150 + 310 = 20460
Step 67: 20460 + 310 = 20770
Step 68: 20770 + 310 = 21080
Step 69: 21080 + 310 = 21390
Step 70: 21390 + 310 = 21700
Step 71: 21700 + 310 = 22010
Step 72: 22010 + 310 = 22320
Step 73: 22320 + 310 = 22630
Step 74: 22630 + 310 = 22940
Step 75: 22940 + 310 = 23250
Step 76: 23250 + 310 = 23560
Step 77: 23560 + 310 = 23870
Step 78: 23870 + 310 = 24180
Step 79: 24180 + 310 = 24490
Step 80: 24490 + 310 = 24800
Step 81: 24800 + 310 = 25110
Step 82: 25110 + 310 = 25420
Step 83: 25420 + 310 = 25730
Step 84: 25730 + 310 = 26040
Step 85: 26040 + 310 = 26350
Step 86: 26350 + 310 = 26660
Step 87: 26660 + 310 = 26970
Step 88: 26970 + 310 = 27280
Step 89: 27280 + 310 = 27590
Step 90: 27590 + 310 = 27900
Step 91: 27900 + 310 = 28210
Step 92: 28210 + 310 = 28520
Step 93: 28520 + 310 = 28830
Step 94: 28830 + 310 = 29140
Step 95: 29140 + 310 = 29450
Step 96: 29450 + 310 = 29760
Step 97: 29760 + 310 = 30070
Step 98: 30070 + 310 = 30380
Step 99: 30380 + 310 = 30690
Step 100: 30690 + 310 = 31000
Step 101: 31000 + 310 = 31310
Step 102: 31310 + 310 = 31620
Step 103: 31620 + 310 = 31930
Step 104: 31930 + 310 = 32240
Step 105: 32240 + 310 = 32550
Step 106: 32550 + 310 = 32860
Step 107: 32860 + 310 = 33170
Step 108: 33170 + 310 = 33480
Step 109: 33480 + 310 = 33790
Step 110: 33790 + 310 = 34100
Step 111: 34100 + 310 = 34410
Step 112: 34410 + 310 = 34720
Step 113: 34720 + 310 = 35030
Step 114: 35030 + 310 = 35340
Step 115: 35340 + 310 = 35650
Step 116: 35650 + 310 = 35960
Step 117: 35960 + 310 = 36270
Step 118: 36270 + 310 = 36580
Step 119: 36580 + 310 = 36890
Step 120: 36890 + 310 = 37200
Step 121: 37200 + 310 = 37510
Step 122: 37510 + 310 = 37820
Step 123: 37820 + 310 = 38130
Step 124: 38130 + 310 = 38440
Step 125: 38440 + 310 = 38750
Step 126: 38750 + 310 = 39060
Step 127: 39060 + 310 = 39370
Step 128: 39370 + 310 = 39680
Step 129: 39680 + 310 = 39990
Step 130: 39990 + 310 = 40300
Step 131: 40300 + 310 = 40610
Step 132: 40610 + 310 = 40920
Step 133: 40920 + 310 = 41230
Step 134: 41230 + 310 = 41540
Step 135: 41540 + 310 = 41850
Step 136: 41850 + 310 = 42160
Step 137: 42160 + 310 = 42470
Step 138: 42470 + 310 = 42780
Step 139: 42780 + 310 = 43090
Step 140: 43090 + 310 = 43400
Step 141: 43400 + 310 = 43710
Step 142: 43710 + 310 = 44020
Step 143: 44020 + 310 = 44330
Step 144: 44330 + 310 = 44640
Step 145: 44640 + 310 = 44950
Step 146: 44950 + 310 = 45260
Step 147: 45260 + 310 = 45570
Step 148: 45570 + 310 = 45880
Step 149: 45880 + 310 = 46190
Step 150: 46190 + 310 = 46500
Step 151: 46500 + 310 = 46810
Step 152: 46810 + 310 = 47120
Step 153: 47120 + 310 = 47430
Step 154: 47430 + 310 = 47740
Step 155: 47740 + 310 = 48050
Step 156: 48050 + 310 = 48360
Step 157: 48360 + 310 = 48670
Step 158: 48670 + 310 = 48980
Step 159: 48980 + 310 = 49290
Step 160: 49290 + 310 = 49600
Step 161: 49600 + 310 = 49910
Step 162: 49910 + 310 = 50220
Step 163: 50220 + 310 = 50530
Step 164: 50530 + 310 = 50840
Step 165: 50840 + 310 = 51150
Step 166: 51150 + 310 = 51460
Step 167: 51460 + 310 = 51770
Step 168: 51770 + 310 = 52080
Step 169: 52080 + 310 = 52390
Step 170: 52390 + 310 = 52700
Step 171: 52700 + 310 = 53010
Step 172: 53010 + 310 = 53320
Step 173: 53320 + 310 = 53630
Step 174: 53630 + 310 = 53940
Step 175: 53940 + 310 = 54250
Step 176: 54250 + 310 = 54560
Step 177: 54560 + 310 = 54870
Step 178: 54870 + 310 = 55180
Step 179: 55180 + 310 = 55490
Step 180: 55490 + 310 = 55800
Step 181: 55800 + 310 = 56110
Step 182: 56110 + 310 = 56420
Step 183: 56420 + 310 = 56730
Step 184: 56730 + 310 = 57040
Step 185: 57040 + 310 = 57350
Step 186: 57350 + 310 = 57660
Step 187: 57660 + 310 = 57970
Step 188: 57970 + 310 = 58280
Step 189: 58280 + 310 = 58590
Step 190: 58590 + 310 = 58900
Step 191: 58900 + 310 = 59210
Step 192: 59210 + 310 = 59520
Step 193: 59520 + 310 = 59830
Step 194: 59830 + 310 = 60140
Step 195: 60140 + 310 = 60450
Step 196: 60450 + 310 = 60760
Step 197: 60760 + 310 = 61070
Step 198: 61070 + 310 = 61380
Step 199: 61380 + 310 = 61690
Step 200: 61690 + 310 = 62000
Step 201: 62000 + 310 = 62310
Step 202: 62310 + 310 = 62620
Step 203: 62620 + 310 = 62930
Step 204: 62930 + 310 = 63240
Step 205: 63240 + 310 = 63550
Step 206: 63550 + 310 = 63860
Step 207: 63860 + 310 = 64170
Step 208: 64170 + 310 = 64480
Step 209: 64480 + 310 = 64790
Step 210: 64790 + 310 = 65100
Step 211: 65100 + 310 = 65410
Step 212: 65410 + 310 = 65720
Step 213: 65720 + 310 = 66030
Step 214: 66030 + 310 = 66340
Step 215: 66340 + 310 = 66650
Step 216: 66650 + 310 = 66960
Step 217: 66960 + 310 = 67270
Step 218: 67270 + 310 = 67580
Step 219: 67580 + 310 = 67890
Step 220: 67890 + 310 = 68200
Step 221: 68200 + 310 = 68510
Step 222: 68510 + 310 = 68820
Step 223: 68820 + 310 = 69130
Step 224: 69130 + 310 = 69440
Step 225: 69440 + 310 = 69750
Step 226: 69750 + 310 = 70060
Step 227: 70060 + 310 = 70370
Step 228: 70370 + 310 = 70680
Step 229: 70680 + 310 = 70990
Step 230: 70990 + 310 = 71300
Step 231: 71300 + 310 = 71610
Step 232: 71610 + 310 = 71920
Step 233: 71920 + 310 = 72230
Step 234: 72230 + 310 = 72540
Step 235: 72540 + 310 = 72850
Step 236: 72850 + 310 = 73160
Step 237: 73160 + 310 = 73470
Step 238: 73470 + 310 = 73780
Step 239: 73780 + 310 = 74090
Step 240: 74090 + 310 = 74400
Step 241: 74400 + 310 = 74710
Step 242: 74710 + 310 = 75020
Step 243: 75020 + 310 = 75330
Step 244: 75330 + 310 = 75640
Step 245: 75640 + 310 = 75950
Step 246: 75950 + 310 = 76260
Step 247: 76260 + 310 = 76570
Step 248: 76570 + 310 = 76880
Step 249: 76880 + 310 = 77190
Step 250: 77190 + 310 = 77500
Step 251: 77500 + 310 = 77810
Step 252: 77810 + 310 = 78120
Step 253: 78120 + 310 = 78430
Step 254: 78430 + 310 = 78740
Step 255: 78740 + 310 = 79050
Step 256: 79050 + 310 = 79360
Step 257: 79360 + 310 = 79670
Step 258: 79670 + 310 = 79980
Step 259: 79980 + 310 = 80290
Step 260: 80290 + 310 = 80600
Step 261: 80600 + 310 = 80910
Step 262: 80910 + 310 = 81220
Step 263: 81220 + 310 = 81530
Step 264: 81530 + 310 = 81840
Step 265: 81840 + 310 = 82150
Step 266: 82150 + 310 = 82460
Step 267: 82460 + 310 = 82770
Step 268: 82770 + 310 = 83080
Step 269: 83080 + 310 = 83390
Step 270: 83390 + 310 = 83700
Step 271: 83700 + 310 = 84010
Step 272: 84010 + 310 = 84320
Step 273: 84320 + 310 = 84630
Step 274: 84630 + 310 = 84940
Step 275: 84940 + 310 = 85250
Step 276: 85250 + 310 = 85560
Step 277: 85560 + 310 = 85870
Step 278: 85870 + 310 = 86180
Step 279: 86180 + 310 = 86490
Step 280: 86490 + 310 = 86800
Step 281: 86800 + 310 = 87110
Step 282: 87110 + 310 = 87420
Step 283: 87420 + 310 = 87730
Step 284: 87730 + 310 = 88040
Step 285: 88040 + 310 = 88350
Step 286: 88350 + 310 = 88660
Step 287: 88660 + 310 = 88970
Step 288: 88970 + 310 = 89280
Step 289: 89280 + 310 = 89590
Step 290: 89590 + 310 = 89900
Step 291: 89900 + 310 = 90210
Step 292: 90210 + 310 = 90520
Step 293: 90520 + 310 = 90830
Step 294: 90830 + 310 = 91140
Step 295: 91140 + 310 = 91450
Step 296: 91450 + 310 = 91760
Step 297: 91760 + 310 = 92070
Step 298: 92070 + 310 = 92380
Step 299: 92380 + 310 = 92690
Step 300: 92690 + 310 = 93000
Step 301: 93000 + 310 = 93310
Step 302: 93310 + 310 = 93620
Step 303: 93620 + 310 = 93930
Step 304: 93930 + 310 = 94240
Step 305: 94240 + 310 = 94550
Step 306: 94550 + 310 = 94860
Step 307: 94860 + 310 = 95170
Step 308: 95170 + 310 = 95480
Step 309: 95480 + 310 = 95790
Step 310: 95790 + 310 = 96100
Step 311: 96100 + 310 = 96410
Step 312: 96410 + 310 = 96720
Step 313: 96720 + 310 = 97030
Step 314: 97030 + 310 = 97340
Step 315: 97340 + 310 = 97650
Step 316: 97650 + 310 = 97960
Step 317: 97960 + 310 = 98270
Step 318: 98270 + 310 = 98580
Step 319: 98580 + 310 = 98890
Step 320: 98890 + 310 = 99200

So, 310*320 = 99200