Alright, let's solve this math problem step by step. First, we have the number 413. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 90. So, we're going to take the number 413 and add it to itself 90 times.
Step 1: 0 + 413 = 413
Step 2: 413 + 413 = 826
Step 3: 826 + 413 = 1239
Step 4: 1239 + 413 = 1652
Step 5: 1652 + 413 = 2065
Step 6: 2065 + 413 = 2478
Step 7: 2478 + 413 = 2891
Step 8: 2891 + 413 = 3304
Step 9: 3304 + 413 = 3717
Step 10: 3717 + 413 = 4130
Step 11: 4130 + 413 = 4543
Step 12: 4543 + 413 = 4956
Step 13: 4956 + 413 = 5369
Step 14: 5369 + 413 = 5782
Step 15: 5782 + 413 = 6195
Step 16: 6195 + 413 = 6608
Step 17: 6608 + 413 = 7021
Step 18: 7021 + 413 = 7434
Step 19: 7434 + 413 = 7847
Step 20: 7847 + 413 = 8260
Step 21: 8260 + 413 = 8673
Step 22: 8673 + 413 = 9086
Step 23: 9086 + 413 = 9499
Step 24: 9499 + 413 = 9912
Step 25: 9912 + 413 = 10325
Step 26: 10325 + 413 = 10738
Step 27: 10738 + 413 = 11151
Step 28: 11151 + 413 = 11564
Step 29: 11564 + 413 = 11977
Step 30: 11977 + 413 = 12390
Step 31: 12390 + 413 = 12803
Step 32: 12803 + 413 = 13216
Step 33: 13216 + 413 = 13629
Step 34: 13629 + 413 = 14042
Step 35: 14042 + 413 = 14455
Step 36: 14455 + 413 = 14868
Step 37: 14868 + 413 = 15281
Step 38: 15281 + 413 = 15694
Step 39: 15694 + 413 = 16107
Step 40: 16107 + 413 = 16520
Step 41: 16520 + 413 = 16933
Step 42: 16933 + 413 = 17346
Step 43: 17346 + 413 = 17759
Step 44: 17759 + 413 = 18172
Step 45: 18172 + 413 = 18585
Step 46: 18585 + 413 = 18998
Step 47: 18998 + 413 = 19411
Step 48: 19411 + 413 = 19824
Step 49: 19824 + 413 = 20237
Step 50: 20237 + 413 = 20650
Step 51: 20650 + 413 = 21063
Step 52: 21063 + 413 = 21476
Step 53: 21476 + 413 = 21889
Step 54: 21889 + 413 = 22302
Step 55: 22302 + 413 = 22715
Step 56: 22715 + 413 = 23128
Step 57: 23128 + 413 = 23541
Step 58: 23541 + 413 = 23954
Step 59: 23954 + 413 = 24367
Step 60: 24367 + 413 = 24780
Step 61: 24780 + 413 = 25193
Step 62: 25193 + 413 = 25606
Step 63: 25606 + 413 = 26019
Step 64: 26019 + 413 = 26432
Step 65: 26432 + 413 = 26845
Step 66: 26845 + 413 = 27258
Step 67: 27258 + 413 = 27671
Step 68: 27671 + 413 = 28084
Step 69: 28084 + 413 = 28497
Step 70: 28497 + 413 = 28910
Step 71: 28910 + 413 = 29323
Step 72: 29323 + 413 = 29736
Step 73: 29736 + 413 = 30149
Step 74: 30149 + 413 = 30562
Step 75: 30562 + 413 = 30975
Step 76: 30975 + 413 = 31388
Step 77: 31388 + 413 = 31801
Step 78: 31801 + 413 = 32214
Step 79: 32214 + 413 = 32627
Step 80: 32627 + 413 = 33040
Step 81: 33040 + 413 = 33453
Step 82: 33453 + 413 = 33866
Step 83: 33866 + 413 = 34279
Step 84: 34279 + 413 = 34692
Step 85: 34692 + 413 = 35105
Step 86: 35105 + 413 = 35518
Step 87: 35518 + 413 = 35931
Step 88: 35931 + 413 = 36344
Step 89: 36344 + 413 = 36757
Step 90: 36757 + 413 = 37170

So, 413*90 = 37170