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 126. So, we're going to take the number 90 and add it to itself 126 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

So, 90*126 = 11340