Alright, let's solve this math problem step by step. First, we have the number 90. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 410. So, we're going to take the number 90 and add it to itself 410 times.
Step 1: 0 + 90 = 90
Step 2: 90 + 90 = 180
Step 3: 180 + 90 = 270
Step 4: 270 + 90 = 360
Step 5: 360 + 90 = 450
Step 6: 450 + 90 = 540
Step 7: 540 + 90 = 630
Step 8: 630 + 90 = 720
Step 9: 720 + 90 = 810
Step 10: 810 + 90 = 900
Step 11: 900 + 90 = 990
Step 12: 990 + 90 = 1080
Step 13: 1080 + 90 = 1170
Step 14: 1170 + 90 = 1260
Step 15: 1260 + 90 = 1350
Step 16: 1350 + 90 = 1440
Step 17: 1440 + 90 = 1530
Step 18: 1530 + 90 = 1620
Step 19: 1620 + 90 = 1710
Step 20: 1710 + 90 = 1800
Step 21: 1800 + 90 = 1890
Step 22: 1890 + 90 = 1980
Step 23: 1980 + 90 = 2070
Step 24: 2070 + 90 = 2160
Step 25: 2160 + 90 = 2250
Step 26: 2250 + 90 = 2340
Step 27: 2340 + 90 = 2430
Step 28: 2430 + 90 = 2520
Step 29: 2520 + 90 = 2610
Step 30: 2610 + 90 = 2700
Step 31: 2700 + 90 = 2790
Step 32: 2790 + 90 = 2880
Step 33: 2880 + 90 = 2970
Step 34: 2970 + 90 = 3060
Step 35: 3060 + 90 = 3150
Step 36: 3150 + 90 = 3240
Step 37: 3240 + 90 = 3330
Step 38: 3330 + 90 = 3420
Step 39: 3420 + 90 = 3510
Step 40: 3510 + 90 = 3600
Step 41: 3600 + 90 = 3690
Step 42: 3690 + 90 = 3780
Step 43: 3780 + 90 = 3870
Step 44: 3870 + 90 = 3960
Step 45: 3960 + 90 = 4050
Step 46: 4050 + 90 = 4140
Step 47: 4140 + 90 = 4230
Step 48: 4230 + 90 = 4320
Step 49: 4320 + 90 = 4410
Step 50: 4410 + 90 = 4500
Step 51: 4500 + 90 = 4590
Step 52: 4590 + 90 = 4680
Step 53: 4680 + 90 = 4770
Step 54: 4770 + 90 = 4860
Step 55: 4860 + 90 = 4950
Step 56: 4950 + 90 = 5040
Step 57: 5040 + 90 = 5130
Step 58: 5130 + 90 = 5220
Step 59: 5220 + 90 = 5310
Step 60: 5310 + 90 = 5400
Step 61: 5400 + 90 = 5490
Step 62: 5490 + 90 = 5580
Step 63: 5580 + 90 = 5670
Step 64: 5670 + 90 = 5760
Step 65: 5760 + 90 = 5850
Step 66: 5850 + 90 = 5940
Step 67: 5940 + 90 = 6030
Step 68: 6030 + 90 = 6120
Step 69: 6120 + 90 = 6210
Step 70: 6210 + 90 = 6300
Step 71: 6300 + 90 = 6390
Step 72: 6390 + 90 = 6480
Step 73: 6480 + 90 = 6570
Step 74: 6570 + 90 = 6660
Step 75: 6660 + 90 = 6750
Step 76: 6750 + 90 = 6840
Step 77: 6840 + 90 = 6930
Step 78: 6930 + 90 = 7020
Step 79: 7020 + 90 = 7110
Step 80: 7110 + 90 = 7200
Step 81: 7200 + 90 = 7290
Step 82: 7290 + 90 = 7380
Step 83: 7380 + 90 = 7470
Step 84: 7470 + 90 = 7560
Step 85: 7560 + 90 = 7650
Step 86: 7650 + 90 = 7740
Step 87: 7740 + 90 = 7830
Step 88: 7830 + 90 = 7920
Step 89: 7920 + 90 = 8010
Step 90: 8010 + 90 = 8100
Step 91: 8100 + 90 = 8190
Step 92: 8190 + 90 = 8280
Step 93: 8280 + 90 = 8370
Step 94: 8370 + 90 = 8460
Step 95: 8460 + 90 = 8550
Step 96: 8550 + 90 = 8640
Step 97: 8640 + 90 = 8730
Step 98: 8730 + 90 = 8820
Step 99: 8820 + 90 = 8910
Step 100: 8910 + 90 = 9000
Step 101: 9000 + 90 = 9090
Step 102: 9090 + 90 = 9180
Step 103: 9180 + 90 = 9270
Step 104: 9270 + 90 = 9360
Step 105: 9360 + 90 = 9450
Step 106: 9450 + 90 = 9540
Step 107: 9540 + 90 = 9630
Step 108: 9630 + 90 = 9720
Step 109: 9720 + 90 = 9810
Step 110: 9810 + 90 = 9900
Step 111: 9900 + 90 = 9990
Step 112: 9990 + 90 = 10080
Step 113: 10080 + 90 = 10170
Step 114: 10170 + 90 = 10260
Step 115: 10260 + 90 = 10350
Step 116: 10350 + 90 = 10440
Step 117: 10440 + 90 = 10530
Step 118: 10530 + 90 = 10620
Step 119: 10620 + 90 = 10710
Step 120: 10710 + 90 = 10800
Step 121: 10800 + 90 = 10890
Step 122: 10890 + 90 = 10980
Step 123: 10980 + 90 = 11070
Step 124: 11070 + 90 = 11160
Step 125: 11160 + 90 = 11250
Step 126: 11250 + 90 = 11340
Step 127: 11340 + 90 = 11430
Step 128: 11430 + 90 = 11520
Step 129: 11520 + 90 = 11610
Step 130: 11610 + 90 = 11700
Step 131: 11700 + 90 = 11790
Step 132: 11790 + 90 = 11880
Step 133: 11880 + 90 = 11970
Step 134: 11970 + 90 = 12060
Step 135: 12060 + 90 = 12150
Step 136: 12150 + 90 = 12240
Step 137: 12240 + 90 = 12330
Step 138: 12330 + 90 = 12420
Step 139: 12420 + 90 = 12510
Step 140: 12510 + 90 = 12600
Step 141: 12600 + 90 = 12690
Step 142: 12690 + 90 = 12780
Step 143: 12780 + 90 = 12870
Step 144: 12870 + 90 = 12960
Step 145: 12960 + 90 = 13050
Step 146: 13050 + 90 = 13140
Step 147: 13140 + 90 = 13230
Step 148: 13230 + 90 = 13320
Step 149: 13320 + 90 = 13410
Step 150: 13410 + 90 = 13500
Step 151: 13500 + 90 = 13590
Step 152: 13590 + 90 = 13680
Step 153: 13680 + 90 = 13770
Step 154: 13770 + 90 = 13860
Step 155: 13860 + 90 = 13950
Step 156: 13950 + 90 = 14040
Step 157: 14040 + 90 = 14130
Step 158: 14130 + 90 = 14220
Step 159: 14220 + 90 = 14310
Step 160: 14310 + 90 = 14400
Step 161: 14400 + 90 = 14490
Step 162: 14490 + 90 = 14580
Step 163: 14580 + 90 = 14670
Step 164: 14670 + 90 = 14760
Step 165: 14760 + 90 = 14850
Step 166: 14850 + 90 = 14940
Step 167: 14940 + 90 = 15030
Step 168: 15030 + 90 = 15120
Step 169: 15120 + 90 = 15210
Step 170: 15210 + 90 = 15300
Step 171: 15300 + 90 = 15390
Step 172: 15390 + 90 = 15480
Step 173: 15480 + 90 = 15570
Step 174: 15570 + 90 = 15660
Step 175: 15660 + 90 = 15750
Step 176: 15750 + 90 = 15840
Step 177: 15840 + 90 = 15930
Step 178: 15930 + 90 = 16020
Step 179: 16020 + 90 = 16110
Step 180: 16110 + 90 = 16200
Step 181: 16200 + 90 = 16290
Step 182: 16290 + 90 = 16380
Step 183: 16380 + 90 = 16470
Step 184: 16470 + 90 = 16560
Step 185: 16560 + 90 = 16650
Step 186: 16650 + 90 = 16740
Step 187: 16740 + 90 = 16830
Step 188: 16830 + 90 = 16920
Step 189: 16920 + 90 = 17010
Step 190: 17010 + 90 = 17100
Step 191: 17100 + 90 = 17190
Step 192: 17190 + 90 = 17280
Step 193: 17280 + 90 = 17370
Step 194: 17370 + 90 = 17460
Step 195: 17460 + 90 = 17550
Step 196: 17550 + 90 = 17640
Step 197: 17640 + 90 = 17730
Step 198: 17730 + 90 = 17820
Step 199: 17820 + 90 = 17910
Step 200: 17910 + 90 = 18000
Step 201: 18000 + 90 = 18090
Step 202: 18090 + 90 = 18180
Step 203: 18180 + 90 = 18270
Step 204: 18270 + 90 = 18360
Step 205: 18360 + 90 = 18450
Step 206: 18450 + 90 = 18540
Step 207: 18540 + 90 = 18630
Step 208: 18630 + 90 = 18720
Step 209: 18720 + 90 = 18810
Step 210: 18810 + 90 = 18900
Step 211: 18900 + 90 = 18990
Step 212: 18990 + 90 = 19080
Step 213: 19080 + 90 = 19170
Step 214: 19170 + 90 = 19260
Step 215: 19260 + 90 = 19350
Step 216: 19350 + 90 = 19440
Step 217: 19440 + 90 = 19530
Step 218: 19530 + 90 = 19620
Step 219: 19620 + 90 = 19710
Step 220: 19710 + 90 = 19800
Step 221: 19800 + 90 = 19890
Step 222: 19890 + 90 = 19980
Step 223: 19980 + 90 = 20070
Step 224: 20070 + 90 = 20160
Step 225: 20160 + 90 = 20250
Step 226: 20250 + 90 = 20340
Step 227: 20340 + 90 = 20430
Step 228: 20430 + 90 = 20520
Step 229: 20520 + 90 = 20610
Step 230: 20610 + 90 = 20700
Step 231: 20700 + 90 = 20790
Step 232: 20790 + 90 = 20880
Step 233: 20880 + 90 = 20970
Step 234: 20970 + 90 = 21060
Step 235: 21060 + 90 = 21150
Step 236: 21150 + 90 = 21240
Step 237: 21240 + 90 = 21330
Step 238: 21330 + 90 = 21420
Step 239: 21420 + 90 = 21510
Step 240: 21510 + 90 = 21600
Step 241: 21600 + 90 = 21690
Step 242: 21690 + 90 = 21780
Step 243: 21780 + 90 = 21870
Step 244: 21870 + 90 = 21960
Step 245: 21960 + 90 = 22050
Step 246: 22050 + 90 = 22140
Step 247: 22140 + 90 = 22230
Step 248: 22230 + 90 = 22320
Step 249: 22320 + 90 = 22410
Step 250: 22410 + 90 = 22500
Step 251: 22500 + 90 = 22590
Step 252: 22590 + 90 = 22680
Step 253: 22680 + 90 = 22770
Step 254: 22770 + 90 = 22860
Step 255: 22860 + 90 = 22950
Step 256: 22950 + 90 = 23040
Step 257: 23040 + 90 = 23130
Step 258: 23130 + 90 = 23220
Step 259: 23220 + 90 = 23310
Step 260: 23310 + 90 = 23400
Step 261: 23400 + 90 = 23490
Step 262: 23490 + 90 = 23580
Step 263: 23580 + 90 = 23670
Step 264: 23670 + 90 = 23760
Step 265: 23760 + 90 = 23850
Step 266: 23850 + 90 = 23940
Step 267: 23940 + 90 = 24030
Step 268: 24030 + 90 = 24120
Step 269: 24120 + 90 = 24210
Step 270: 24210 + 90 = 24300
Step 271: 24300 + 90 = 24390
Step 272: 24390 + 90 = 24480
Step 273: 24480 + 90 = 24570
Step 274: 24570 + 90 = 24660
Step 275: 24660 + 90 = 24750
Step 276: 24750 + 90 = 24840
Step 277: 24840 + 90 = 24930
Step 278: 24930 + 90 = 25020
Step 279: 25020 + 90 = 25110
Step 280: 25110 + 90 = 25200
Step 281: 25200 + 90 = 25290
Step 282: 25290 + 90 = 25380
Step 283: 25380 + 90 = 25470
Step 284: 25470 + 90 = 25560
Step 285: 25560 + 90 = 25650
Step 286: 25650 + 90 = 25740
Step 287: 25740 + 90 = 25830
Step 288: 25830 + 90 = 25920
Step 289: 25920 + 90 = 26010
Step 290: 26010 + 90 = 26100
Step 291: 26100 + 90 = 26190
Step 292: 26190 + 90 = 26280
Step 293: 26280 + 90 = 26370
Step 294: 26370 + 90 = 26460
Step 295: 26460 + 90 = 26550
Step 296: 26550 + 90 = 26640
Step 297: 26640 + 90 = 26730
Step 298: 26730 + 90 = 26820
Step 299: 26820 + 90 = 26910
Step 300: 26910 + 90 = 27000
Step 301: 27000 + 90 = 27090
Step 302: 27090 + 90 = 27180
Step 303: 27180 + 90 = 27270
Step 304: 27270 + 90 = 27360
Step 305: 27360 + 90 = 27450
Step 306: 27450 + 90 = 27540
Step 307: 27540 + 90 = 27630
Step 308: 27630 + 90 = 27720
Step 309: 27720 + 90 = 27810
Step 310: 27810 + 90 = 27900
Step 311: 27900 + 90 = 27990
Step 312: 27990 + 90 = 28080
Step 313: 28080 + 90 = 28170
Step 314: 28170 + 90 = 28260
Step 315: 28260 + 90 = 28350
Step 316: 28350 + 90 = 28440
Step 317: 28440 + 90 = 28530
Step 318: 28530 + 90 = 28620
Step 319: 28620 + 90 = 28710
Step 320: 28710 + 90 = 28800
Step 321: 28800 + 90 = 28890
Step 322: 28890 + 90 = 28980
Step 323: 28980 + 90 = 29070
Step 324: 29070 + 90 = 29160
Step 325: 29160 + 90 = 29250
Step 326: 29250 + 90 = 29340
Step 327: 29340 + 90 = 29430
Step 328: 29430 + 90 = 29520
Step 329: 29520 + 90 = 29610
Step 330: 29610 + 90 = 29700
Step 331: 29700 + 90 = 29790
Step 332: 29790 + 90 = 29880
Step 333: 29880 + 90 = 29970
Step 334: 29970 + 90 = 30060
Step 335: 30060 + 90 = 30150
Step 336: 30150 + 90 = 30240
Step 337: 30240 + 90 = 30330
Step 338: 30330 + 90 = 30420
Step 339: 30420 + 90 = 30510
Step 340: 30510 + 90 = 30600
Step 341: 30600 + 90 = 30690
Step 342: 30690 + 90 = 30780
Step 343: 30780 + 90 = 30870
Step 344: 30870 + 90 = 30960
Step 345: 30960 + 90 = 31050
Step 346: 31050 + 90 = 31140
Step 347: 31140 + 90 = 31230
Step 348: 31230 + 90 = 31320
Step 349: 31320 + 90 = 31410
Step 350: 31410 + 90 = 31500
Step 351: 31500 + 90 = 31590
Step 352: 31590 + 90 = 31680
Step 353: 31680 + 90 = 31770
Step 354: 31770 + 90 = 31860
Step 355: 31860 + 90 = 31950
Step 356: 31950 + 90 = 32040
Step 357: 32040 + 90 = 32130
Step 358: 32130 + 90 = 32220
Step 359: 32220 + 90 = 32310
Step 360: 32310 + 90 = 32400
Step 361: 32400 + 90 = 32490
Step 362: 32490 + 90 = 32580
Step 363: 32580 + 90 = 32670
Step 364: 32670 + 90 = 32760
Step 365: 32760 + 90 = 32850
Step 366: 32850 + 90 = 32940
Step 367: 32940 + 90 = 33030
Step 368: 33030 + 90 = 33120
Step 369: 33120 + 90 = 33210
Step 370: 33210 + 90 = 33300
Step 371: 33300 + 90 = 33390
Step 372: 33390 + 90 = 33480
Step 373: 33480 + 90 = 33570
Step 374: 33570 + 90 = 33660
Step 375: 33660 + 90 = 33750
Step 376: 33750 + 90 = 33840
Step 377: 33840 + 90 = 33930
Step 378: 33930 + 90 = 34020
Step 379: 34020 + 90 = 34110
Step 380: 34110 + 90 = 34200
Step 381: 34200 + 90 = 34290
Step 382: 34290 + 90 = 34380
Step 383: 34380 + 90 = 34470
Step 384: 34470 + 90 = 34560
Step 385: 34560 + 90 = 34650
Step 386: 34650 + 90 = 34740
Step 387: 34740 + 90 = 34830
Step 388: 34830 + 90 = 34920
Step 389: 34920 + 90 = 35010
Step 390: 35010 + 90 = 35100
Step 391: 35100 + 90 = 35190
Step 392: 35190 + 90 = 35280
Step 393: 35280 + 90 = 35370
Step 394: 35370 + 90 = 35460
Step 395: 35460 + 90 = 35550
Step 396: 35550 + 90 = 35640
Step 397: 35640 + 90 = 35730
Step 398: 35730 + 90 = 35820
Step 399: 35820 + 90 = 35910
Step 400: 35910 + 90 = 36000
Step 401: 36000 + 90 = 36090
Step 402: 36090 + 90 = 36180
Step 403: 36180 + 90 = 36270
Step 404: 36270 + 90 = 36360
Step 405: 36360 + 90 = 36450
Step 406: 36450 + 90 = 36540
Step 407: 36540 + 90 = 36630
Step 408: 36630 + 90 = 36720
Step 409: 36720 + 90 = 36810
Step 410: 36810 + 90 = 36900

So, 90*410 = 36900