Let's roll up our sleeves and solve this. We have 156 and we're going to multiply it by 340, essentially adding 156 to itself 340 times.
Step 1: 0 + 156 = 156
Step 2: 156 + 156 = 312
Step 3: 312 + 156 = 468
Step 4: 468 + 156 = 624
Step 5: 624 + 156 = 780
Step 6: 780 + 156 = 936
Step 7: 936 + 156 = 1092
Step 8: 1092 + 156 = 1248
Step 9: 1248 + 156 = 1404
Step 10: 1404 + 156 = 1560
Step 11: 1560 + 156 = 1716
Step 12: 1716 + 156 = 1872
Step 13: 1872 + 156 = 2028
Step 14: 2028 + 156 = 2184
Step 15: 2184 + 156 = 2340
Step 16: 2340 + 156 = 2496
Step 17: 2496 + 156 = 2652
Step 18: 2652 + 156 = 2808
Step 19: 2808 + 156 = 2964
Step 20: 2964 + 156 = 3120
Step 21: 3120 + 156 = 3276
Step 22: 3276 + 156 = 3432
Step 23: 3432 + 156 = 3588
Step 24: 3588 + 156 = 3744
Step 25: 3744 + 156 = 3900
Step 26: 3900 + 156 = 4056
Step 27: 4056 + 156 = 4212
Step 28: 4212 + 156 = 4368
Step 29: 4368 + 156 = 4524
Step 30: 4524 + 156 = 4680
Step 31: 4680 + 156 = 4836
Step 32: 4836 + 156 = 4992
Step 33: 4992 + 156 = 5148
Step 34: 5148 + 156 = 5304
Step 35: 5304 + 156 = 5460
Step 36: 5460 + 156 = 5616
Step 37: 5616 + 156 = 5772
Step 38: 5772 + 156 = 5928
Step 39: 5928 + 156 = 6084
Step 40: 6084 + 156 = 6240
Step 41: 6240 + 156 = 6396
Step 42: 6396 + 156 = 6552
Step 43: 6552 + 156 = 6708
Step 44: 6708 + 156 = 6864
Step 45: 6864 + 156 = 7020
Step 46: 7020 + 156 = 7176
Step 47: 7176 + 156 = 7332
Step 48: 7332 + 156 = 7488
Step 49: 7488 + 156 = 7644
Step 50: 7644 + 156 = 7800
Step 51: 7800 + 156 = 7956
Step 52: 7956 + 156 = 8112
Step 53: 8112 + 156 = 8268
Step 54: 8268 + 156 = 8424
Step 55: 8424 + 156 = 8580
Step 56: 8580 + 156 = 8736
Step 57: 8736 + 156 = 8892
Step 58: 8892 + 156 = 9048
Step 59: 9048 + 156 = 9204
Step 60: 9204 + 156 = 9360
Step 61: 9360 + 156 = 9516
Step 62: 9516 + 156 = 9672
Step 63: 9672 + 156 = 9828
Step 64: 9828 + 156 = 9984
Step 65: 9984 + 156 = 10140
Step 66: 10140 + 156 = 10296
Step 67: 10296 + 156 = 10452
Step 68: 10452 + 156 = 10608
Step 69: 10608 + 156 = 10764
Step 70: 10764 + 156 = 10920
Step 71: 10920 + 156 = 11076
Step 72: 11076 + 156 = 11232
Step 73: 11232 + 156 = 11388
Step 74: 11388 + 156 = 11544
Step 75: 11544 + 156 = 11700
Step 76: 11700 + 156 = 11856
Step 77: 11856 + 156 = 12012
Step 78: 12012 + 156 = 12168
Step 79: 12168 + 156 = 12324
Step 80: 12324 + 156 = 12480
Step 81: 12480 + 156 = 12636
Step 82: 12636 + 156 = 12792
Step 83: 12792 + 156 = 12948
Step 84: 12948 + 156 = 13104
Step 85: 13104 + 156 = 13260
Step 86: 13260 + 156 = 13416
Step 87: 13416 + 156 = 13572
Step 88: 13572 + 156 = 13728
Step 89: 13728 + 156 = 13884
Step 90: 13884 + 156 = 14040
Step 91: 14040 + 156 = 14196
Step 92: 14196 + 156 = 14352
Step 93: 14352 + 156 = 14508
Step 94: 14508 + 156 = 14664
Step 95: 14664 + 156 = 14820
Step 96: 14820 + 156 = 14976
Step 97: 14976 + 156 = 15132
Step 98: 15132 + 156 = 15288
Step 99: 15288 + 156 = 15444
Step 100: 15444 + 156 = 15600
Step 101: 15600 + 156 = 15756
Step 102: 15756 + 156 = 15912
Step 103: 15912 + 156 = 16068
Step 104: 16068 + 156 = 16224
Step 105: 16224 + 156 = 16380
Step 106: 16380 + 156 = 16536
Step 107: 16536 + 156 = 16692
Step 108: 16692 + 156 = 16848
Step 109: 16848 + 156 = 17004
Step 110: 17004 + 156 = 17160
Step 111: 17160 + 156 = 17316
Step 112: 17316 + 156 = 17472
Step 113: 17472 + 156 = 17628
Step 114: 17628 + 156 = 17784
Step 115: 17784 + 156 = 17940
Step 116: 17940 + 156 = 18096
Step 117: 18096 + 156 = 18252
Step 118: 18252 + 156 = 18408
Step 119: 18408 + 156 = 18564
Step 120: 18564 + 156 = 18720
Step 121: 18720 + 156 = 18876
Step 122: 18876 + 156 = 19032
Step 123: 19032 + 156 = 19188
Step 124: 19188 + 156 = 19344
Step 125: 19344 + 156 = 19500
Step 126: 19500 + 156 = 19656
Step 127: 19656 + 156 = 19812
Step 128: 19812 + 156 = 19968
Step 129: 19968 + 156 = 20124
Step 130: 20124 + 156 = 20280
Step 131: 20280 + 156 = 20436
Step 132: 20436 + 156 = 20592
Step 133: 20592 + 156 = 20748
Step 134: 20748 + 156 = 20904
Step 135: 20904 + 156 = 21060
Step 136: 21060 + 156 = 21216
Step 137: 21216 + 156 = 21372
Step 138: 21372 + 156 = 21528
Step 139: 21528 + 156 = 21684
Step 140: 21684 + 156 = 21840
Step 141: 21840 + 156 = 21996
Step 142: 21996 + 156 = 22152
Step 143: 22152 + 156 = 22308
Step 144: 22308 + 156 = 22464
Step 145: 22464 + 156 = 22620
Step 146: 22620 + 156 = 22776
Step 147: 22776 + 156 = 22932
Step 148: 22932 + 156 = 23088
Step 149: 23088 + 156 = 23244
Step 150: 23244 + 156 = 23400
Step 151: 23400 + 156 = 23556
Step 152: 23556 + 156 = 23712
Step 153: 23712 + 156 = 23868
Step 154: 23868 + 156 = 24024
Step 155: 24024 + 156 = 24180
Step 156: 24180 + 156 = 24336
Step 157: 24336 + 156 = 24492
Step 158: 24492 + 156 = 24648
Step 159: 24648 + 156 = 24804
Step 160: 24804 + 156 = 24960
Step 161: 24960 + 156 = 25116
Step 162: 25116 + 156 = 25272
Step 163: 25272 + 156 = 25428
Step 164: 25428 + 156 = 25584
Step 165: 25584 + 156 = 25740
Step 166: 25740 + 156 = 25896
Step 167: 25896 + 156 = 26052
Step 168: 26052 + 156 = 26208
Step 169: 26208 + 156 = 26364
Step 170: 26364 + 156 = 26520
Step 171: 26520 + 156 = 26676
Step 172: 26676 + 156 = 26832
Step 173: 26832 + 156 = 26988
Step 174: 26988 + 156 = 27144
Step 175: 27144 + 156 = 27300
Step 176: 27300 + 156 = 27456
Step 177: 27456 + 156 = 27612
Step 178: 27612 + 156 = 27768
Step 179: 27768 + 156 = 27924
Step 180: 27924 + 156 = 28080
Step 181: 28080 + 156 = 28236
Step 182: 28236 + 156 = 28392
Step 183: 28392 + 156 = 28548
Step 184: 28548 + 156 = 28704
Step 185: 28704 + 156 = 28860
Step 186: 28860 + 156 = 29016
Step 187: 29016 + 156 = 29172
Step 188: 29172 + 156 = 29328
Step 189: 29328 + 156 = 29484
Step 190: 29484 + 156 = 29640
Step 191: 29640 + 156 = 29796
Step 192: 29796 + 156 = 29952
Step 193: 29952 + 156 = 30108
Step 194: 30108 + 156 = 30264
Step 195: 30264 + 156 = 30420
Step 196: 30420 + 156 = 30576
Step 197: 30576 + 156 = 30732
Step 198: 30732 + 156 = 30888
Step 199: 30888 + 156 = 31044
Step 200: 31044 + 156 = 31200
Step 201: 31200 + 156 = 31356
Step 202: 31356 + 156 = 31512
Step 203: 31512 + 156 = 31668
Step 204: 31668 + 156 = 31824
Step 205: 31824 + 156 = 31980
Step 206: 31980 + 156 = 32136
Step 207: 32136 + 156 = 32292
Step 208: 32292 + 156 = 32448
Step 209: 32448 + 156 = 32604
Step 210: 32604 + 156 = 32760
Step 211: 32760 + 156 = 32916
Step 212: 32916 + 156 = 33072
Step 213: 33072 + 156 = 33228
Step 214: 33228 + 156 = 33384
Step 215: 33384 + 156 = 33540
Step 216: 33540 + 156 = 33696
Step 217: 33696 + 156 = 33852
Step 218: 33852 + 156 = 34008
Step 219: 34008 + 156 = 34164
Step 220: 34164 + 156 = 34320
Step 221: 34320 + 156 = 34476
Step 222: 34476 + 156 = 34632
Step 223: 34632 + 156 = 34788
Step 224: 34788 + 156 = 34944
Step 225: 34944 + 156 = 35100
Step 226: 35100 + 156 = 35256
Step 227: 35256 + 156 = 35412
Step 228: 35412 + 156 = 35568
Step 229: 35568 + 156 = 35724
Step 230: 35724 + 156 = 35880
Step 231: 35880 + 156 = 36036
Step 232: 36036 + 156 = 36192
Step 233: 36192 + 156 = 36348
Step 234: 36348 + 156 = 36504
Step 235: 36504 + 156 = 36660
Step 236: 36660 + 156 = 36816
Step 237: 36816 + 156 = 36972
Step 238: 36972 + 156 = 37128
Step 239: 37128 + 156 = 37284
Step 240: 37284 + 156 = 37440
Step 241: 37440 + 156 = 37596
Step 242: 37596 + 156 = 37752
Step 243: 37752 + 156 = 37908
Step 244: 37908 + 156 = 38064
Step 245: 38064 + 156 = 38220
Step 246: 38220 + 156 = 38376
Step 247: 38376 + 156 = 38532
Step 248: 38532 + 156 = 38688
Step 249: 38688 + 156 = 38844
Step 250: 38844 + 156 = 39000
Step 251: 39000 + 156 = 39156
Step 252: 39156 + 156 = 39312
Step 253: 39312 + 156 = 39468
Step 254: 39468 + 156 = 39624
Step 255: 39624 + 156 = 39780
Step 256: 39780 + 156 = 39936
Step 257: 39936 + 156 = 40092
Step 258: 40092 + 156 = 40248
Step 259: 40248 + 156 = 40404
Step 260: 40404 + 156 = 40560
Step 261: 40560 + 156 = 40716
Step 262: 40716 + 156 = 40872
Step 263: 40872 + 156 = 41028
Step 264: 41028 + 156 = 41184
Step 265: 41184 + 156 = 41340
Step 266: 41340 + 156 = 41496
Step 267: 41496 + 156 = 41652
Step 268: 41652 + 156 = 41808
Step 269: 41808 + 156 = 41964
Step 270: 41964 + 156 = 42120
Step 271: 42120 + 156 = 42276
Step 272: 42276 + 156 = 42432
Step 273: 42432 + 156 = 42588
Step 274: 42588 + 156 = 42744
Step 275: 42744 + 156 = 42900
Step 276: 42900 + 156 = 43056
Step 277: 43056 + 156 = 43212
Step 278: 43212 + 156 = 43368
Step 279: 43368 + 156 = 43524
Step 280: 43524 + 156 = 43680
Step 281: 43680 + 156 = 43836
Step 282: 43836 + 156 = 43992
Step 283: 43992 + 156 = 44148
Step 284: 44148 + 156 = 44304
Step 285: 44304 + 156 = 44460
Step 286: 44460 + 156 = 44616
Step 287: 44616 + 156 = 44772
Step 288: 44772 + 156 = 44928
Step 289: 44928 + 156 = 45084
Step 290: 45084 + 156 = 45240
Step 291: 45240 + 156 = 45396
Step 292: 45396 + 156 = 45552
Step 293: 45552 + 156 = 45708
Step 294: 45708 + 156 = 45864
Step 295: 45864 + 156 = 46020
Step 296: 46020 + 156 = 46176
Step 297: 46176 + 156 = 46332
Step 298: 46332 + 156 = 46488
Step 299: 46488 + 156 = 46644
Step 300: 46644 + 156 = 46800
Step 301: 46800 + 156 = 46956
Step 302: 46956 + 156 = 47112
Step 303: 47112 + 156 = 47268
Step 304: 47268 + 156 = 47424
Step 305: 47424 + 156 = 47580
Step 306: 47580 + 156 = 47736
Step 307: 47736 + 156 = 47892
Step 308: 47892 + 156 = 48048
Step 309: 48048 + 156 = 48204
Step 310: 48204 + 156 = 48360
Step 311: 48360 + 156 = 48516
Step 312: 48516 + 156 = 48672
Step 313: 48672 + 156 = 48828
Step 314: 48828 + 156 = 48984
Step 315: 48984 + 156 = 49140
Step 316: 49140 + 156 = 49296
Step 317: 49296 + 156 = 49452
Step 318: 49452 + 156 = 49608
Step 319: 49608 + 156 = 49764
Step 320: 49764 + 156 = 49920
Step 321: 49920 + 156 = 50076
Step 322: 50076 + 156 = 50232
Step 323: 50232 + 156 = 50388
Step 324: 50388 + 156 = 50544
Step 325: 50544 + 156 = 50700
Step 326: 50700 + 156 = 50856
Step 327: 50856 + 156 = 51012
Step 328: 51012 + 156 = 51168
Step 329: 51168 + 156 = 51324
Step 330: 51324 + 156 = 51480
Step 331: 51480 + 156 = 51636
Step 332: 51636 + 156 = 51792
Step 333: 51792 + 156 = 51948
Step 334: 51948 + 156 = 52104
Step 335: 52104 + 156 = 52260
Step 336: 52260 + 156 = 52416
Step 337: 52416 + 156 = 52572
Step 338: 52572 + 156 = 52728
Step 339: 52728 + 156 = 52884
Step 340: 52884 + 156 = 53040

So, 156*340 = 53040